Age Owner Branch data TLA Line data Source code
1 : : /*-------------------------------------------------------------------------
2 : : *
3 : : * ri_triggers.c
4 : : *
5 : : * Generic trigger procedures for referential integrity constraint
6 : : * checks.
7 : : *
8 : : * Note about memory management: the private hashtables kept here live
9 : : * across query and transaction boundaries, in fact they live as long as
10 : : * the backend does. This works because the hashtable structures
11 : : * themselves are allocated by dynahash.c in its permanent DynaHashCxt,
12 : : * and the SPI plans they point to are saved using SPI_keepplan().
13 : : * There is not currently any provision for throwing away a no-longer-needed
14 : : * plan --- consider improving this someday.
15 : : *
16 : : *
17 : : * Portions Copyright (c) 1996-2026, PostgreSQL Global Development Group
18 : : *
19 : : * src/backend/utils/adt/ri_triggers.c
20 : : *
21 : : *-------------------------------------------------------------------------
22 : : */
23 : :
24 : : #include "postgres.h"
25 : :
26 : : #include "access/amapi.h"
27 : : #include "access/genam.h"
28 : : #include "access/htup_details.h"
29 : : #include "access/skey.h"
30 : : #include "access/sysattr.h"
31 : : #include "access/table.h"
32 : : #include "access/tableam.h"
33 : : #include "access/xact.h"
34 : : #include "catalog/index.h"
35 : : #include "catalog/pg_am_d.h"
36 : : #include "catalog/pg_collation.h"
37 : : #include "catalog/pg_constraint.h"
38 : : #include "catalog/pg_namespace.h"
39 : : #include "commands/trigger.h"
40 : : #include "executor/executor.h"
41 : : #include "executor/spi.h"
42 : : #include "lib/ilist.h"
43 : : #include "miscadmin.h"
44 : : #include "parser/parse_coerce.h"
45 : : #include "parser/parse_relation.h"
46 : : #include "utils/acl.h"
47 : : #include "utils/builtins.h"
48 : : #include "utils/datum.h"
49 : : #include "utils/fmgroids.h"
50 : : #include "utils/guc.h"
51 : : #include "utils/hsearch.h"
52 : : #include "utils/injection_point.h"
53 : : #include "utils/inval.h"
54 : : #include "utils/lsyscache.h"
55 : : #include "utils/memutils.h"
56 : : #include "utils/rel.h"
57 : : #include "utils/rls.h"
58 : : #include "utils/ruleutils.h"
59 : : #include "utils/snapmgr.h"
60 : : #include "utils/syscache.h"
61 : :
62 : : /*
63 : : * Local definitions
64 : : */
65 : :
66 : : #define RI_MAX_NUMKEYS INDEX_MAX_KEYS
67 : :
68 : : #define RI_INIT_CONSTRAINTHASHSIZE 64
69 : : #define RI_INIT_QUERYHASHSIZE (RI_INIT_CONSTRAINTHASHSIZE * 4)
70 : :
71 : : #define RI_KEYS_ALL_NULL 0
72 : : #define RI_KEYS_SOME_NULL 1
73 : : #define RI_KEYS_NONE_NULL 2
74 : :
75 : : /* RI query type codes */
76 : : /* these queries are executed against the PK (referenced) table: */
77 : : #define RI_PLAN_CHECK_LOOKUPPK 1
78 : : #define RI_PLAN_CHECK_LOOKUPPK_FROM_PK 2
79 : : #define RI_PLAN_LAST_ON_PK RI_PLAN_CHECK_LOOKUPPK_FROM_PK
80 : : /* these queries are executed against the FK (referencing) table: */
81 : : #define RI_PLAN_CASCADE_ONDELETE 3
82 : : #define RI_PLAN_CASCADE_ONUPDATE 4
83 : : #define RI_PLAN_NO_ACTION 5
84 : : /* For RESTRICT, the same plan can be used for both ON DELETE and ON UPDATE triggers. */
85 : : #define RI_PLAN_RESTRICT 6
86 : : #define RI_PLAN_SETNULL_ONDELETE 7
87 : : #define RI_PLAN_SETNULL_ONUPDATE 8
88 : : #define RI_PLAN_SETDEFAULT_ONDELETE 9
89 : : #define RI_PLAN_SETDEFAULT_ONUPDATE 10
90 : :
91 : : #define MAX_QUOTED_NAME_LEN (NAMEDATALEN*2+3)
92 : : #define MAX_QUOTED_REL_NAME_LEN (MAX_QUOTED_NAME_LEN*2)
93 : :
94 : : #define RIAttName(rel, attnum) NameStr(*attnumAttName(rel, attnum))
95 : : #define RIAttType(rel, attnum) attnumTypeId(rel, attnum)
96 : : #define RIAttCollation(rel, attnum) attnumCollationId(rel, attnum)
97 : :
98 : : #define RI_TRIGTYPE_INSERT 1
99 : : #define RI_TRIGTYPE_UPDATE 2
100 : : #define RI_TRIGTYPE_DELETE 3
101 : :
102 : : typedef struct FastPathMeta FastPathMeta;
103 : :
104 : : /*
105 : : * RI_ConstraintInfo
106 : : *
107 : : * Information extracted from an FK pg_constraint entry. This is cached in
108 : : * ri_constraint_cache.
109 : : *
110 : : * Note that pf/pp/ff_eq_oprs may hold the overlaps operator instead of equals
111 : : * for the PERIOD part of a temporal foreign key.
112 : : */
113 : : typedef struct RI_ConstraintInfo
114 : : {
115 : : Oid constraint_id; /* OID of pg_constraint entry (hash key) */
116 : : bool valid; /* successfully initialized? */
117 : : Oid constraint_root_id; /* OID of topmost ancestor constraint;
118 : : * same as constraint_id if not inherited */
119 : : uint32 oidHashValue; /* hash value of constraint_id */
120 : : uint32 rootHashValue; /* hash value of constraint_root_id */
121 : : NameData conname; /* name of the FK constraint */
122 : : Oid pk_relid; /* referenced relation */
123 : : Oid fk_relid; /* referencing relation */
124 : : char confupdtype; /* foreign key's ON UPDATE action */
125 : : char confdeltype; /* foreign key's ON DELETE action */
126 : : int ndelsetcols; /* number of columns referenced in ON DELETE
127 : : * SET clause */
128 : : int16 confdelsetcols[RI_MAX_NUMKEYS]; /* attnums of cols to set on
129 : : * delete */
130 : : char confmatchtype; /* foreign key's match type */
131 : : bool hasperiod; /* if the foreign key uses PERIOD */
132 : : int nkeys; /* number of key columns */
133 : : int16 pk_attnums[RI_MAX_NUMKEYS]; /* attnums of referenced cols */
134 : : int16 fk_attnums[RI_MAX_NUMKEYS]; /* attnums of referencing cols */
135 : : Oid pf_eq_oprs[RI_MAX_NUMKEYS]; /* equality operators (PK = FK) */
136 : : Oid pp_eq_oprs[RI_MAX_NUMKEYS]; /* equality operators (PK = PK) */
137 : : Oid ff_eq_oprs[RI_MAX_NUMKEYS]; /* equality operators (FK = FK) */
138 : : Oid period_contained_by_oper; /* anyrange <@ anyrange (or
139 : : * multiranges) */
140 : : Oid agged_period_contained_by_oper; /* fkattr <@ range_agg(pkattr) */
141 : : Oid period_intersect_oper; /* anyrange * anyrange (or
142 : : * multiranges) */
143 : : dlist_node valid_link; /* Link in list of valid entries */
144 : :
145 : : Oid conindid;
146 : : bool pk_is_partitioned;
147 : : bool pk_index_is_btree; /* is conindid a btree index? */
148 : :
149 : : FastPathMeta *fpmeta;
150 : : } RI_ConstraintInfo;
151 : :
152 : : typedef struct RI_CompareHashEntry RI_CompareHashEntry;
153 : :
154 : : /* Fast-path metadata for RI checks on foreign key referencing tables */
155 : : typedef struct FastPathMeta
156 : : {
157 : : FmgrInfo eq_opr_finfo[RI_MAX_NUMKEYS];
158 : : FmgrInfo cast_func_finfo[RI_MAX_NUMKEYS];
159 : : RegProcedure regops[RI_MAX_NUMKEYS];
160 : : Oid subtypes[RI_MAX_NUMKEYS];
161 : : int strats[RI_MAX_NUMKEYS];
162 : : AttrNumber index_attnos[RI_MAX_NUMKEYS]; /* index column positions */
163 : :
164 : : /*
165 : : * fn_mcxt for the cached FmgrInfos above. Cast and equality functions
166 : : * (e.g. record_eq()) use fn_mcxt as scratch space, caching state there
167 : : * and keeping a pointer to it in FmgrInfo.fn_extra. Give them a context
168 : : * of their own, created with this struct and destroyed with it in
169 : : * AtEOXact_RI().
170 : : *
171 : : * Note this context must not be reset while the FmgrInfos remain in use,
172 : : * since that would free the state fn_extra still points at.
173 : : */
174 : : MemoryContext scratch_cxt;
175 : :
176 : : /* Link in ri_fpmeta_dead_list while awaiting deferred release */
177 : : struct FastPathMeta *next_dead;
178 : : } FastPathMeta;
179 : :
180 : : /*
181 : : * RI_QueryKey
182 : : *
183 : : * The key identifying a prepared SPI plan in our query hashtable
184 : : */
185 : : typedef struct RI_QueryKey
186 : : {
187 : : Oid constr_id; /* OID of pg_constraint entry */
188 : : int32 constr_queryno; /* query type ID, see RI_PLAN_XXX above */
189 : : } RI_QueryKey;
190 : :
191 : : /*
192 : : * RI_QueryHashEntry
193 : : */
194 : : typedef struct RI_QueryHashEntry
195 : : {
196 : : RI_QueryKey key;
197 : : SPIPlanPtr plan;
198 : : } RI_QueryHashEntry;
199 : :
200 : : /*
201 : : * RI_CompareKey
202 : : *
203 : : * The key identifying an entry showing how to compare two values
204 : : */
205 : : typedef struct RI_CompareKey
206 : : {
207 : : Oid eq_opr; /* the equality operator to apply */
208 : : Oid typeid; /* the data type to apply it to */
209 : : } RI_CompareKey;
210 : :
211 : : /*
212 : : * RI_CompareHashEntry
213 : : */
214 : : typedef struct RI_CompareHashEntry
215 : : {
216 : : RI_CompareKey key;
217 : : bool valid; /* successfully initialized? */
218 : : FmgrInfo eq_opr_finfo; /* call info for equality fn */
219 : : FmgrInfo cast_func_finfo; /* in case we must coerce input */
220 : : } RI_CompareHashEntry;
221 : :
222 : : /*
223 : : * Maximum number of FK rows buffered before flushing.
224 : : *
225 : : * Larger batches amortize per-flush overhead and let the SK_SEARCHARRAY
226 : : * path walk more leaf pages in a single sorted traversal. But each
227 : : * buffered row is a materialized HeapTuple in flush_cxt, and the matched[]
228 : : * scan in ri_FastPathFlushArray() is O(batch_size) per index match.
229 : : * Benchmarking showed little difference between 16 and 64, with 256
230 : : * consistently slower. 64 is a reasonable default.
231 : : */
232 : : #define RI_FASTPATH_BATCH_SIZE 64
233 : :
234 : : /*
235 : : * RI_FastPathKey
236 : : * Hash key for an RI_FastPathEntry.
237 : : *
238 : : * A constraint can be checked in nested trigger-firing cycles. Each cycle
239 : : * must have a separate entry so that its rows are checked with that cycle's
240 : : * snapshot and its resources are released by that cycle's callback.
241 : : */
242 : : typedef struct RI_FastPathKey
243 : : {
244 : : Oid conoid; /* pg_constraint OID */
245 : : int query_depth; /* after-trigger query depth */
246 : : } RI_FastPathKey;
247 : :
248 : : /*
249 : : * RI_FastPathEntry
250 : : * Per-constraint, per-firing-cycle cache of resources needed by
251 : : * ri_FastPathBatchFlush().
252 : : *
253 : : * Created lazily by ri_FastPathGetEntry() on first use within a
254 : : * trigger-firing batch and torn down by ri_FastPathTeardown() at batch end.
255 : : *
256 : : * FK tuples are buffered in batch[] across trigger invocations and
257 : : * flushed when the buffer fills or the batch ends.
258 : : *
259 : : * RI_FastPathEntry is not subject to cache invalidation. The cached
260 : : * relations are held open with locks for the transaction duration, preventing
261 : : * relcache invalidation. The entry itself is torn down at batch end by
262 : : * ri_FastPathEndBatch(); on abort, ResourceOwner releases the cached
263 : : * relations and AtEOXact_RI() NULLs the static cache pointer to prevent
264 : : * any subsequent access.
265 : : */
266 : : typedef struct RI_FastPathEntry
267 : : {
268 : : RI_FastPathKey key; /* hash key */
269 : : Oid fk_relid; /* for ri_FastPathEndBatch() */
270 : : Relation pk_rel;
271 : : Relation idx_rel;
272 : : TupleTableSlot *pk_slot;
273 : : TupleTableSlot *fk_slot;
274 : : MemoryContext flush_cxt; /* short-lived context for per-flush work */
275 : :
276 : : /*
277 : : * TODO: batch[] is HeapTuple[] because the AFTER trigger machinery
278 : : * currently passes tuples as HeapTuples. Once trigger infrastructure is
279 : : * slotified, this should use a slot array or whatever batched tuple
280 : : * storage abstraction exists at that point to be TAM-agnostic.
281 : : */
282 : : HeapTuple batch[RI_FASTPATH_BATCH_SIZE];
283 : : int batch_count;
284 : :
285 : : /*
286 : : * true while this entry's batch is being flushed; guards against
287 : : * re-entrant ri_FastPathBatchAdd from user code run during the flush.
288 : : */
289 : : bool flushing;
290 : :
291 : : /*
292 : : * Subtransaction whose resource owner opened this entry's relations.
293 : : * AtEOSubXact_RI() drops only entries matching an aborting subxact, so a
294 : : * subxact abort during outer-level trigger firing leaves the outer batch
295 : : * intact.
296 : : */
297 : : SubTransactionId subid;
298 : : } RI_FastPathEntry;
299 : :
300 : : /*
301 : : * Local data
302 : : */
303 : : static HTAB *ri_constraint_cache = NULL;
304 : : static HTAB *ri_query_cache = NULL;
305 : : static HTAB *ri_compare_cache = NULL;
306 : : static dclist_head ri_constraint_cache_valid_list;
307 : :
308 : : static HTAB *ri_fastpath_cache = NULL;
309 : : static bool ri_fastpath_flushing = false;
310 : :
311 : : /*
312 : : * FastPathMeta objects detached from their cache entry by invalidation, but
313 : : * possibly still referenced by an RI check further up the stack. Released
314 : : * by AtEOXact_RI(), where no such reference can exist. See
315 : : * InvalidateConstraintCacheCallBack().
316 : : */
317 : : static FastPathMeta *ri_fpmeta_dead_list = NULL;
318 : :
319 : : /*
320 : : * Local function prototypes
321 : : */
322 : : static bool ri_Check_Pk_Match(Relation pk_rel, Relation fk_rel,
323 : : TupleTableSlot *oldslot,
324 : : const RI_ConstraintInfo *riinfo);
325 : : static Datum ri_restrict(TriggerData *trigdata, bool is_no_action);
326 : : static Datum ri_set(TriggerData *trigdata, bool is_set_null, int tgkind);
327 : : static void quoteOneName(char *buffer, const char *name);
328 : : static void quoteRelationName(char *buffer, Relation rel);
329 : : static void ri_GenerateQual(StringInfo buf,
330 : : const char *sep,
331 : : const char *leftop, Oid leftoptype,
332 : : Oid opoid,
333 : : const char *rightop, Oid rightoptype);
334 : : static void ri_GenerateQualCollation(StringInfo buf, Oid collation);
335 : : static int ri_NullCheck(TupleDesc tupDesc, TupleTableSlot *slot,
336 : : const RI_ConstraintInfo *riinfo, bool rel_is_pk);
337 : : static void ri_BuildQueryKey(RI_QueryKey *key,
338 : : const RI_ConstraintInfo *riinfo,
339 : : int32 constr_queryno);
340 : : static bool ri_KeysEqual(Relation rel, TupleTableSlot *oldslot, TupleTableSlot *newslot,
341 : : const RI_ConstraintInfo *riinfo, bool rel_is_pk);
342 : : static bool ri_CompareWithCast(Oid eq_opr, Oid typeid, Oid collid,
343 : : Datum lhs, Datum rhs);
344 : :
345 : : static void ri_InitHashTables(void);
346 : : static void InvalidateConstraintCacheCallBack(Datum arg, SysCacheIdentifier cacheid,
347 : : uint32 hashvalue);
348 : : static SPIPlanPtr ri_FetchPreparedPlan(RI_QueryKey *key);
349 : : static void ri_HashPreparedPlan(RI_QueryKey *key, SPIPlanPtr plan);
350 : : static RI_CompareHashEntry *ri_HashCompareOp(Oid eq_opr, Oid typeid);
351 : :
352 : : static void ri_CheckTrigger(FunctionCallInfo fcinfo, const char *funcname,
353 : : int tgkind);
354 : : static RI_ConstraintInfo *ri_FetchConstraintInfo(Trigger *trigger,
355 : : Relation trig_rel, bool rel_is_pk);
356 : : static RI_ConstraintInfo *ri_LoadConstraintInfo(Oid constraintOid);
357 : : static Oid get_ri_constraint_root(Oid constrOid);
358 : : static SPIPlanPtr ri_PlanCheck(const char *querystr, int nargs, const Oid *argtypes,
359 : : RI_QueryKey *qkey, Relation fk_rel, Relation pk_rel);
360 : : static bool ri_PerformCheck(const RI_ConstraintInfo *riinfo,
361 : : RI_QueryKey *qkey, SPIPlanPtr qplan,
362 : : Relation fk_rel, Relation pk_rel,
363 : : TupleTableSlot *oldslot, TupleTableSlot *newslot,
364 : : bool is_restrict,
365 : : bool detectNewRows, int expect_OK);
366 : : static void ri_FastPathCheck(RI_ConstraintInfo *riinfo,
367 : : Relation fk_rel, TupleTableSlot *newslot);
368 : : static void ri_FastPathBatchAdd(RI_ConstraintInfo *riinfo,
369 : : Relation fk_rel, TupleTableSlot *newslot);
370 : : static void ri_FastPathBatchFlush(RI_FastPathEntry *fpentry, Relation fk_rel,
371 : : RI_ConstraintInfo *riinfo);
372 : : static int ri_FastPathFlushArray(RI_FastPathEntry *fpentry, TupleTableSlot *fk_slot,
373 : : const RI_ConstraintInfo *riinfo,
374 : : FastPathMeta *fpmeta, Relation fk_rel,
375 : : Snapshot snapshot, IndexScanDesc scandesc);
376 : : static int ri_FastPathFlushLoop(RI_FastPathEntry *fpentry, TupleTableSlot *fk_slot,
377 : : const RI_ConstraintInfo *riinfo,
378 : : FastPathMeta *fpmeta, Relation fk_rel,
379 : : Snapshot snapshot, IndexScanDesc scandesc);
380 : : static bool ri_FastPathProbeOne(Relation pk_rel, Relation idx_rel,
381 : : IndexScanDesc scandesc, TupleTableSlot *slot,
382 : : Snapshot snapshot, const RI_ConstraintInfo *riinfo,
383 : : ScanKeyData *skey, int nkeys);
384 : : static bool ri_LockPKTuple(Relation pk_rel, TupleTableSlot *slot, Snapshot snap,
385 : : bool *concurrently_updated);
386 : : static bool ri_fastpath_is_applicable(const RI_ConstraintInfo *riinfo);
387 : : static void ri_CheckPermissions(Relation query_rel);
388 : : static bool recheck_matched_pk_tuple(Relation idxrel, ScanKeyData *skeys,
389 : : int nkeys, TupleTableSlot *new_slot);
390 : : static void build_index_scankeys(const RI_ConstraintInfo *riinfo,
391 : : FastPathMeta *fpmeta,
392 : : Relation idx_rel, Datum *pk_vals,
393 : : char *pk_nulls, ScanKey skeys);
394 : : static void ri_populate_fastpath_metadata(RI_ConstraintInfo *riinfo,
395 : : Relation fk_rel, Relation idx_rel);
396 : : static void ri_ExtractValues(Relation rel, TupleTableSlot *slot,
397 : : const RI_ConstraintInfo *riinfo, bool rel_is_pk,
398 : : Datum *vals, char *nulls);
399 : : pg_noreturn static void ri_ReportViolation(const RI_ConstraintInfo *riinfo,
400 : : Relation pk_rel, Relation fk_rel,
401 : : TupleTableSlot *violatorslot, TupleDesc tupdesc,
402 : : int queryno, bool is_restrict, bool partgone);
403 : : static RI_FastPathEntry *ri_FastPathGetEntry(const RI_ConstraintInfo *riinfo,
404 : : Relation fk_rel);
405 : : static void ri_FastPathEndBatch(void *arg);
406 : : static void ri_FastPathTeardown(int depth);
407 : :
408 : :
409 : : /*
410 : : * RI_FKey_check -
411 : : *
412 : : * Check foreign key existence (combined for INSERT and UPDATE).
413 : : */
414 : : static Datum
5182 tgl@sss.pgh.pa.us 415 :CBC 607062 : RI_FKey_check(TriggerData *trigdata)
416 : : {
417 : : RI_ConstraintInfo *riinfo;
418 : : Relation fk_rel;
419 : : Relation pk_rel;
420 : : TupleTableSlot *newslot;
421 : : RI_QueryKey qkey;
422 : : SPIPlanPtr qplan;
423 : :
5181 424 : 607062 : riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
425 : : trigdata->tg_relation, false);
426 : :
9820 JanWieck@Yahoo.com 427 [ + + ]: 607062 : if (TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
2739 andres@anarazel.de 428 : 296 : newslot = trigdata->tg_newslot;
429 : : else
430 : 606766 : newslot = trigdata->tg_trigslot;
431 : :
432 : : /*
433 : : * We should not even consider checking the row if it is no longer valid,
434 : : * since it was either deleted (so the deferred check should be skipped)
435 : : * or updated (in which case only the latest version of the row should be
436 : : * checked). Test its liveness according to SnapshotSelf. We need pin
437 : : * and lock on the buffer to call HeapTupleSatisfiesVisibility. Caller
438 : : * should be holding pin, but not lock.
439 : : */
2726 440 [ + + ]: 607062 : if (!table_tuple_satisfies_snapshot(trigdata->tg_relation, newslot, SnapshotSelf))
441 : 40 : return PointerGetDatum(NULL);
442 : :
7311 tgl@sss.pgh.pa.us 443 : 607022 : fk_rel = trigdata->tg_relation;
444 : :
2739 andres@anarazel.de 445 [ + + + - ]: 607022 : switch (ri_NullCheck(RelationGetDescr(fk_rel), newslot, riinfo, false))
446 : : {
9698 JanWieck@Yahoo.com 447 : 102 : case RI_KEYS_ALL_NULL:
448 : :
449 : : /*
450 : : * No further check needed - an all-NULL key passes every type of
451 : : * foreign key constraint.
452 : : */
9586 tgl@sss.pgh.pa.us 453 : 102 : return PointerGetDatum(NULL);
454 : :
9698 JanWieck@Yahoo.com 455 : 104 : case RI_KEYS_SOME_NULL:
456 : :
457 : : /*
458 : : * This is the only case that differs between the three kinds of
459 : : * MATCH.
460 : : */
5181 tgl@sss.pgh.pa.us 461 [ + + - ]: 104 : switch (riinfo->confmatchtype)
462 : : {
7134 463 : 24 : case FKCONSTR_MATCH_FULL:
464 : :
465 : : /*
466 : : * Not allowed - MATCH FULL says either all or none of the
467 : : * attributes can be NULLs
468 : : */
8437 469 [ + - ]: 24 : ereport(ERROR,
470 : : (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
471 : : errmsg("insert or update on table \"%s\" violates foreign key constraint \"%s\"",
472 : : RelationGetRelationName(fk_rel),
473 : : NameStr(riinfo->conname)),
474 : : errdetail("MATCH FULL does not allow mixing of null and nonnull key values."),
475 : : errtableconstraint(fk_rel,
476 : : NameStr(riinfo->conname))));
477 : : return PointerGetDatum(NULL);
478 : :
5184 479 : 80 : case FKCONSTR_MATCH_SIMPLE:
480 : :
481 : : /*
482 : : * MATCH SIMPLE - if ANY column is null, the key passes
483 : : * the constraint.
484 : : */
9586 485 : 80 : return PointerGetDatum(NULL);
486 : :
487 : : #ifdef NOT_USED
488 : : case FKCONSTR_MATCH_PARTIAL:
489 : :
490 : : /*
491 : : * MATCH PARTIAL - all non-null columns must match. (not
492 : : * implemented, can be done by modifying the query below
493 : : * to only include non-null columns, or by writing a
494 : : * special version here)
495 : : */
496 : : break;
497 : : #endif
498 : : }
499 : :
500 : : case RI_KEYS_NONE_NULL:
501 : :
502 : : /*
503 : : * Have a full qualified key - continue below for all three kinds
504 : : * of MATCH.
505 : : */
9698 JanWieck@Yahoo.com 506 : 606816 : break;
507 : : }
508 : :
509 : : /*
510 : : * Fast path: probe the PK unique index directly, bypassing SPI.
511 : : *
512 : : * For non-partitioned, non-temporal FKs, we can skip the SPI machinery
513 : : * (plan cache, executor setup, etc.) and do a direct index scan + tuple
514 : : * lock. This is semantically equivalent to the SPI path below but avoids
515 : : * the per-row executor overhead.
516 : : *
517 : : * ri_FastPathBatchAdd() and ri_FastPathCheck() report the violation
518 : : * themselves if no matching PK row is found, so they only return on
519 : : * success.
520 : : */
149 amitlan@postgresql.o 521 [ + + ]: 606816 : if (ri_fastpath_is_applicable(riinfo))
522 : : {
5 523 [ + + + - ]: 606066 : if (AfterTriggerIsActive() && !ri_fastpath_flushing)
524 : : {
525 : : /* Batched path: buffer and probe in groups */
146 526 : 606014 : ri_FastPathBatchAdd(riinfo, fk_rel, newslot);
527 : : }
528 : : else
529 : : {
530 : : /*
531 : : * Per-row path, used when batching is not applicable:
532 : : *
533 : : * - ALTER TABLE validation, where no after-trigger firing is
534 : : * active;
535 : : *
536 : : * - a re-entrant check from user cast/operator code running
537 : : * during a batch flush, since adding a cache entry while
538 : : * ri_FastPathEndBatch is iterating the cache could leave it
539 : : * unflushed.
540 : : */
541 : 52 : ri_FastPathCheck(riinfo, fk_rel, newslot);
542 : : }
149 543 : 606054 : return PointerGetDatum(NULL);
544 : : }
545 : :
717 tgl@sss.pgh.pa.us 546 : 750 : SPI_connect();
547 : :
548 : : /*
549 : : * pk_rel is opened in RowShareLock mode since that's what our eventual
550 : : * SELECT FOR KEY SHARE will get on it.
551 : : */
149 amitlan@postgresql.o 552 : 750 : pk_rel = table_open(riinfo->pk_relid, RowShareLock);
553 : :
554 : : /* Fetch or prepare a saved plan for the real check */
1603 alvherre@alvh.no-ip. 555 : 750 : ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CHECK_LOOKUPPK);
556 : :
557 [ + + ]: 750 : if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
558 : : {
559 : : StringInfoData querybuf;
560 : : char pkrelname[MAX_QUOTED_REL_NAME_LEN];
561 : : char attname[MAX_QUOTED_NAME_LEN];
562 : : char paramname[16];
563 : : const char *querysep;
564 : : Oid queryoids[RI_MAX_NUMKEYS];
565 : : const char *pk_only;
566 : :
567 : : /* ----------
568 : : * The query string built is
569 : : * SELECT 1 FROM [ONLY] <pktable> x WHERE pkatt1 = $1 [AND ...]
570 : : * FOR KEY SHARE OF x
571 : : * The type id's for the $ parameters are those of the
572 : : * corresponding FK attributes.
573 : : *
574 : : * But for temporal FKs we need to make sure
575 : : * the FK's range is completely covered.
576 : : * So we use this query instead:
577 : : * SELECT 1
578 : : * FROM (
579 : : * SELECT pkperiodatt AS r
580 : : * FROM [ONLY] pktable x
581 : : * WHERE pkatt1 = $1 [AND ...]
582 : : * AND pkperiodatt && $n
583 : : * FOR KEY SHARE OF x
584 : : * ) x1
585 : : * HAVING $n <@ range_agg(x1.r)
586 : : * Note if FOR KEY SHARE ever allows GROUP BY and HAVING
587 : : * we can make this a bit simpler.
588 : : * ----------
589 : : */
590 : 359 : initStringInfo(&querybuf);
591 : 718 : pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
592 [ + + ]: 359 : "" : "ONLY ";
593 : 359 : quoteRelationName(pkrelname, pk_rel);
709 peter@eisentraut.org 594 [ + + ]: 359 : if (riinfo->hasperiod)
595 : : {
596 : 67 : quoteOneName(attname,
597 : 67 : RIAttName(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]));
598 : :
599 : 67 : appendStringInfo(&querybuf,
600 : : "SELECT 1 FROM (SELECT %s AS r FROM %s%s x",
601 : : attname, pk_only, pkrelname);
602 : : }
603 : : else
604 : : {
605 : 292 : appendStringInfo(&querybuf, "SELECT 1 FROM %s%s x",
606 : : pk_only, pkrelname);
607 : : }
1603 alvherre@alvh.no-ip. 608 : 359 : querysep = "WHERE";
609 [ + + ]: 801 : for (int i = 0; i < riinfo->nkeys; i++)
610 : : {
611 : 442 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
612 : 442 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
613 : :
614 : 442 : quoteOneName(attname,
615 : 442 : RIAttName(pk_rel, riinfo->pk_attnums[i]));
616 : 442 : sprintf(paramname, "$%d", i + 1);
617 : 442 : ri_GenerateQual(&querybuf, querysep,
618 : : attname, pk_type,
619 : : riinfo->pf_eq_oprs[i],
620 : : paramname, fk_type);
621 : 442 : querysep = "AND";
622 : 442 : queryoids[i] = fk_type;
623 : : }
624 : 359 : appendStringInfoString(&querybuf, " FOR KEY SHARE OF x");
709 peter@eisentraut.org 625 [ + + ]: 359 : if (riinfo->hasperiod)
626 : : {
627 : 67 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]);
628 : :
503 drowley@postgresql.o 629 : 67 : appendStringInfoString(&querybuf, ") x1 HAVING ");
709 peter@eisentraut.org 630 : 67 : sprintf(paramname, "$%d", riinfo->nkeys);
631 : 67 : ri_GenerateQual(&querybuf, "",
632 : : paramname, fk_type,
633 : : riinfo->agged_period_contained_by_oper,
634 : : "pg_catalog.range_agg", ANYMULTIRANGEOID);
503 drowley@postgresql.o 635 : 67 : appendStringInfoString(&querybuf, "(x1.r)");
636 : : }
637 : :
638 : : /* Prepare and save the plan */
1603 alvherre@alvh.no-ip. 639 : 359 : qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
640 : : &qkey, fk_rel, pk_rel);
641 : : }
642 : :
643 : : /*
644 : : * Now check that foreign key exists in PK table
645 : : *
646 : : * XXX detectNewRows must be true when a partitioned table is on the
647 : : * referenced side. The reason is that our snapshot must be fresh in
648 : : * order for the hack in find_inheritance_children() to work.
649 : : */
650 : 750 : ri_PerformCheck(riinfo, &qkey, qplan,
651 : : fk_rel, pk_rel,
652 : : NULL, newslot,
653 : : false,
654 : 750 : pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE,
655 : : SPI_OK_SELECT);
656 : :
657 [ - + ]: 614 : if (SPI_finish() != SPI_OK_FINISH)
1603 alvherre@alvh.no-ip. 658 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
659 : :
2775 andres@anarazel.de 660 :CBC 614 : table_close(pk_rel, RowShareLock);
661 : :
9586 tgl@sss.pgh.pa.us 662 : 614 : return PointerGetDatum(NULL);
663 : : }
664 : :
665 : :
666 : : /*
667 : : * RI_FKey_check_ins -
668 : : *
669 : : * Check foreign key existence at insert event on FK table.
670 : : */
671 : : Datum
672 : 606766 : RI_FKey_check_ins(PG_FUNCTION_ARGS)
673 : : {
674 : : /* Check that this is a valid trigger call on the right time and event. */
5182 675 : 606766 : ri_CheckTrigger(fcinfo, "RI_FKey_check_ins", RI_TRIGTYPE_INSERT);
676 : :
677 : : /* Share code with UPDATE case. */
678 : 606766 : return RI_FKey_check((TriggerData *) fcinfo->context);
679 : : }
680 : :
681 : :
682 : : /*
683 : : * RI_FKey_check_upd -
684 : : *
685 : : * Check foreign key existence at update event on FK table.
686 : : */
687 : : Datum
9586 688 : 296 : RI_FKey_check_upd(PG_FUNCTION_ARGS)
689 : : {
690 : : /* Check that this is a valid trigger call on the right time and event. */
5182 691 : 296 : ri_CheckTrigger(fcinfo, "RI_FKey_check_upd", RI_TRIGTYPE_UPDATE);
692 : :
693 : : /* Share code with INSERT case. */
694 : 296 : return RI_FKey_check((TriggerData *) fcinfo->context);
695 : : }
696 : :
697 : :
698 : : /*
699 : : * ri_Check_Pk_Match
700 : : *
701 : : * Check to see if another PK row has been created that provides the same
702 : : * key values as the "oldslot" that's been modified or deleted in our trigger
703 : : * event. Returns true if a match is found in the PK table.
704 : : *
705 : : * We assume the caller checked that the oldslot contains no NULL key values,
706 : : * since otherwise a match is impossible.
707 : : */
708 : : static bool
8566 709 : 530 : ri_Check_Pk_Match(Relation pk_rel, Relation fk_rel,
710 : : TupleTableSlot *oldslot,
711 : : const RI_ConstraintInfo *riinfo)
712 : : {
713 : : SPIPlanPtr qplan;
714 : : RI_QueryKey qkey;
715 : : bool result;
716 : :
717 : : /* Only called for non-null rows */
2739 andres@anarazel.de 718 [ - + ]: 530 : Assert(ri_NullCheck(RelationGetDescr(pk_rel), oldslot, riinfo, true) == RI_KEYS_NONE_NULL);
719 : :
717 tgl@sss.pgh.pa.us 720 : 530 : SPI_connect();
721 : :
722 : : /*
723 : : * Fetch or prepare a saved plan for checking PK table with values coming
724 : : * from a PK row
725 : : */
1603 alvherre@alvh.no-ip. 726 : 530 : ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CHECK_LOOKUPPK_FROM_PK);
727 : :
728 [ + + ]: 530 : if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
729 : : {
730 : : StringInfoData querybuf;
731 : : char pkrelname[MAX_QUOTED_REL_NAME_LEN];
732 : : char attname[MAX_QUOTED_NAME_LEN];
733 : : char paramname[16];
734 : : const char *querysep;
735 : : const char *pk_only;
736 : : Oid queryoids[RI_MAX_NUMKEYS];
737 : :
738 : : /* ----------
739 : : * The query string built is
740 : : * SELECT 1 FROM [ONLY] <pktable> x WHERE pkatt1 = $1 [AND ...]
741 : : * FOR KEY SHARE OF x
742 : : * The type id's for the $ parameters are those of the
743 : : * PK attributes themselves.
744 : : *
745 : : * But for temporal FKs we need to make sure
746 : : * the old PK's range is completely covered.
747 : : * So we use this query instead:
748 : : * SELECT 1
749 : : * FROM (
750 : : * SELECT pkperiodatt AS r
751 : : * FROM [ONLY] pktable x
752 : : * WHERE pkatt1 = $1 [AND ...]
753 : : * AND pkperiodatt && $n
754 : : * FOR KEY SHARE OF x
755 : : * ) x1
756 : : * HAVING $n <@ range_agg(x1.r)
757 : : * Note if FOR KEY SHARE ever allows GROUP BY and HAVING
758 : : * we can make this a bit simpler.
759 : : * ----------
760 : : */
761 : 249 : initStringInfo(&querybuf);
762 : 498 : pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
763 [ + + ]: 249 : "" : "ONLY ";
764 : 249 : quoteRelationName(pkrelname, pk_rel);
709 peter@eisentraut.org 765 [ - + ]: 249 : if (riinfo->hasperiod)
766 : : {
709 peter@eisentraut.org 767 :UBC 0 : quoteOneName(attname, RIAttName(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]));
768 : :
769 : 0 : appendStringInfo(&querybuf,
770 : : "SELECT 1 FROM (SELECT %s AS r FROM %s%s x",
771 : : attname, pk_only, pkrelname);
772 : : }
773 : : else
774 : : {
709 peter@eisentraut.org 775 :CBC 249 : appendStringInfo(&querybuf, "SELECT 1 FROM %s%s x",
776 : : pk_only, pkrelname);
777 : : }
1603 alvherre@alvh.no-ip. 778 : 249 : querysep = "WHERE";
779 [ + + ]: 572 : for (int i = 0; i < riinfo->nkeys; i++)
780 : : {
781 : 323 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
782 : :
783 : 323 : quoteOneName(attname,
784 : 323 : RIAttName(pk_rel, riinfo->pk_attnums[i]));
785 : 323 : sprintf(paramname, "$%d", i + 1);
786 : 323 : ri_GenerateQual(&querybuf, querysep,
787 : : attname, pk_type,
788 : 323 : riinfo->pp_eq_oprs[i],
789 : : paramname, pk_type);
790 : 323 : querysep = "AND";
791 : 323 : queryoids[i] = pk_type;
792 : : }
793 : 249 : appendStringInfoString(&querybuf, " FOR KEY SHARE OF x");
709 peter@eisentraut.org 794 [ - + ]: 249 : if (riinfo->hasperiod)
795 : : {
709 peter@eisentraut.org 796 :UBC 0 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]);
797 : :
503 drowley@postgresql.o 798 : 0 : appendStringInfoString(&querybuf, ") x1 HAVING ");
709 peter@eisentraut.org 799 : 0 : sprintf(paramname, "$%d", riinfo->nkeys);
800 : 0 : ri_GenerateQual(&querybuf, "",
801 : : paramname, fk_type,
802 : 0 : riinfo->agged_period_contained_by_oper,
803 : : "pg_catalog.range_agg", ANYMULTIRANGEOID);
503 drowley@postgresql.o 804 : 0 : appendStringInfoString(&querybuf, "(x1.r)");
805 : : }
806 : :
807 : : /* Prepare and save the plan */
1603 alvherre@alvh.no-ip. 808 :CBC 249 : qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
809 : : &qkey, fk_rel, pk_rel);
810 : : }
811 : :
812 : : /*
813 : : * We have a plan now. Run it.
814 : : */
815 : 530 : result = ri_PerformCheck(riinfo, &qkey, qplan,
816 : : fk_rel, pk_rel,
817 : : oldslot, NULL,
818 : : false,
819 : : true, /* treat like update */
820 : : SPI_OK_SELECT);
821 : :
822 [ - + ]: 530 : if (SPI_finish() != SPI_OK_FINISH)
1603 alvherre@alvh.no-ip. 823 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
824 : :
1603 alvherre@alvh.no-ip. 825 :CBC 530 : return result;
826 : : }
827 : :
828 : :
829 : : /*
830 : : * RI_FKey_noaction_del -
831 : : *
832 : : * Give an error and roll back the current transaction if the
833 : : * delete has resulted in a violation of the given referential
834 : : * integrity constraint.
835 : : */
836 : : Datum
9586 tgl@sss.pgh.pa.us 837 : 313 : RI_FKey_noaction_del(PG_FUNCTION_ARGS)
838 : : {
839 : : /* Check that this is a valid trigger call on the right time and event. */
8566 840 : 313 : ri_CheckTrigger(fcinfo, "RI_FKey_noaction_del", RI_TRIGTYPE_DELETE);
841 : :
842 : : /* Share code with RESTRICT/UPDATE cases. */
3204 843 : 313 : return ri_restrict((TriggerData *) fcinfo->context, true);
844 : : }
845 : :
846 : : /*
847 : : * RI_FKey_restrict_del -
848 : : *
849 : : * Restrict delete from PK table to rows unreferenced by foreign key.
850 : : *
851 : : * The SQL standard intends that this referential action occur exactly when
852 : : * the delete is performed, rather than after. This appears to be
853 : : * the only difference between "NO ACTION" and "RESTRICT". In Postgres
854 : : * we still implement this as an AFTER trigger, but it's non-deferrable.
855 : : */
856 : : Datum
5182 857 : 8 : RI_FKey_restrict_del(PG_FUNCTION_ARGS)
858 : : {
859 : : /* Check that this is a valid trigger call on the right time and event. */
860 : 8 : ri_CheckTrigger(fcinfo, "RI_FKey_restrict_del", RI_TRIGTYPE_DELETE);
861 : :
862 : : /* Share code with NO ACTION/UPDATE cases. */
3204 863 : 8 : return ri_restrict((TriggerData *) fcinfo->context, false);
864 : : }
865 : :
866 : : /*
867 : : * RI_FKey_noaction_upd -
868 : : *
869 : : * Give an error and roll back the current transaction if the
870 : : * update has resulted in a violation of the given referential
871 : : * integrity constraint.
872 : : */
873 : : Datum
5182 874 : 363 : RI_FKey_noaction_upd(PG_FUNCTION_ARGS)
875 : : {
876 : : /* Check that this is a valid trigger call on the right time and event. */
877 : 363 : ri_CheckTrigger(fcinfo, "RI_FKey_noaction_upd", RI_TRIGTYPE_UPDATE);
878 : :
879 : : /* Share code with RESTRICT/DELETE cases. */
3204 880 : 363 : return ri_restrict((TriggerData *) fcinfo->context, true);
881 : : }
882 : :
883 : : /*
884 : : * RI_FKey_restrict_upd -
885 : : *
886 : : * Restrict update of PK to rows unreferenced by foreign key.
887 : : *
888 : : * The SQL standard intends that this referential action occur exactly when
889 : : * the update is performed, rather than after. This appears to be
890 : : * the only difference between "NO ACTION" and "RESTRICT". In Postgres
891 : : * we still implement this as an AFTER trigger, but it's non-deferrable.
892 : : */
893 : : Datum
5182 894 : 20 : RI_FKey_restrict_upd(PG_FUNCTION_ARGS)
895 : : {
896 : : /* Check that this is a valid trigger call on the right time and event. */
897 : 20 : ri_CheckTrigger(fcinfo, "RI_FKey_restrict_upd", RI_TRIGTYPE_UPDATE);
898 : :
899 : : /* Share code with NO ACTION/DELETE cases. */
3204 900 : 20 : return ri_restrict((TriggerData *) fcinfo->context, false);
901 : : }
902 : :
903 : : /*
904 : : * ri_restrict -
905 : : *
906 : : * Common code for ON DELETE RESTRICT, ON DELETE NO ACTION,
907 : : * ON UPDATE RESTRICT, and ON UPDATE NO ACTION.
908 : : */
909 : : static Datum
910 : 792 : ri_restrict(TriggerData *trigdata, bool is_no_action)
911 : : {
912 : : const RI_ConstraintInfo *riinfo;
913 : : Relation fk_rel;
914 : : Relation pk_rel;
915 : : TupleTableSlot *oldslot;
916 : : RI_QueryKey qkey;
917 : : SPIPlanPtr qplan;
918 : :
5181 919 : 792 : riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
920 : : trigdata->tg_relation, true);
921 : :
922 : : /*
923 : : * Get the relation descriptors of the FK and PK tables and the old tuple.
924 : : *
925 : : * fk_rel is opened in RowShareLock mode since that's what our eventual
926 : : * SELECT FOR KEY SHARE will get on it.
927 : : */
2775 andres@anarazel.de 928 : 792 : fk_rel = table_open(riinfo->fk_relid, RowShareLock);
9633 bruce@momjian.us 929 : 792 : pk_rel = trigdata->tg_relation;
2737 peter@eisentraut.org 930 : 792 : oldslot = trigdata->tg_trigslot;
931 : :
932 : : /*
933 : : * If another PK row now exists providing the old key values, we should
934 : : * not do anything. However, this check should only be made in the NO
935 : : * ACTION case; in RESTRICT cases we don't wish to allow another row to be
936 : : * substituted.
937 : : *
938 : : * If the foreign key has PERIOD, we incorporate looking for replacement
939 : : * rows in the main SQL query below, so we needn't do it here.
940 : : */
583 941 [ + + + + : 1322 : if (is_no_action && !riinfo->hasperiod &&
+ + ]
2737 942 : 530 : ri_Check_Pk_Match(pk_rel, fk_rel, oldslot, riinfo))
943 : : {
944 : 38 : table_close(fk_rel, RowShareLock);
945 : 38 : return PointerGetDatum(NULL);
946 : : }
947 : :
717 tgl@sss.pgh.pa.us 948 : 754 : SPI_connect();
949 : :
950 : : /*
951 : : * Fetch or prepare a saved plan for the restrict lookup (it's the same
952 : : * query for delete and update cases)
953 : : */
564 peter@eisentraut.org 954 [ + + ]: 754 : ri_BuildQueryKey(&qkey, riinfo, is_no_action ? RI_PLAN_NO_ACTION : RI_PLAN_RESTRICT);
955 : :
2737 956 [ + + ]: 754 : if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
957 : : {
958 : : StringInfoData querybuf;
959 : : char pkrelname[MAX_QUOTED_REL_NAME_LEN];
960 : : char fkrelname[MAX_QUOTED_REL_NAME_LEN];
961 : : char attname[MAX_QUOTED_NAME_LEN];
962 : : char periodattname[MAX_QUOTED_NAME_LEN];
963 : : char paramname[16];
964 : : const char *querysep;
965 : : Oid queryoids[RI_MAX_NUMKEYS];
966 : : const char *fk_only;
967 : :
968 : : /* ----------
969 : : * The query string built is
970 : : * SELECT 1 FROM [ONLY] <fktable> x WHERE $1 = fkatt1 [AND ...]
971 : : * FOR KEY SHARE OF x
972 : : * The type id's for the $ parameters are those of the
973 : : * corresponding PK attributes.
974 : : * ----------
975 : : */
976 : 312 : initStringInfo(&querybuf);
977 : 624 : fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
978 [ + + ]: 312 : "" : "ONLY ";
979 : 312 : quoteRelationName(fkrelname, fk_rel);
980 : 312 : appendStringInfo(&querybuf, "SELECT 1 FROM %s%s x",
981 : : fk_only, fkrelname);
982 : 312 : querysep = "WHERE";
983 [ + + ]: 788 : for (int i = 0; i < riinfo->nkeys; i++)
984 : : {
985 : 476 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
986 : 476 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
987 : :
988 : 476 : quoteOneName(attname,
989 : 476 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
990 : 476 : sprintf(paramname, "$%d", i + 1);
991 : 476 : ri_GenerateQual(&querybuf, querysep,
992 : : paramname, pk_type,
993 : 476 : riinfo->pf_eq_oprs[i],
994 : : attname, fk_type);
995 : 476 : querysep = "AND";
996 : 476 : queryoids[i] = pk_type;
997 : : }
998 : :
999 : : /*----------
1000 : : * For temporal foreign keys, a reference could still be valid if the
1001 : : * referenced range didn't change too much. Also if a referencing
1002 : : * range extends past the current PK row, we don't want to check that
1003 : : * part: some other PK row should fulfill it. We only want to check
1004 : : * the part matching the PK record we've changed. Therefore to find
1005 : : * invalid records we do this:
1006 : : *
1007 : : * SELECT 1 FROM [ONLY] <fktable> x WHERE $1 = x.fkatt1 [AND ...]
1008 : : * -- begin temporal
1009 : : * AND $n && x.fkperiod
1010 : : * AND NOT coalesce((x.fkperiod * $n) <@
1011 : : * (SELECT range_agg(r)
1012 : : * FROM (SELECT y.pkperiod r
1013 : : * FROM [ONLY] <pktable> y
1014 : : * WHERE $1 = y.pkatt1 [AND ...] AND $n && y.pkperiod
1015 : : * FOR KEY SHARE OF y) y2), false)
1016 : : * -- end temporal
1017 : : * FOR KEY SHARE OF x
1018 : : *
1019 : : * We need the coalesce in case the first subquery returns no rows.
1020 : : * We need the second subquery because FOR KEY SHARE doesn't support
1021 : : * aggregate queries.
1022 : : */
583 1023 [ + + + - ]: 312 : if (riinfo->hasperiod && is_no_action)
1024 : : {
1025 : 90 : Oid pk_period_type = RIAttType(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]);
1026 : 90 : Oid fk_period_type = RIAttType(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]);
1027 : : StringInfoData intersectbuf;
1028 : : StringInfoData replacementsbuf;
1029 : 180 : char *pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
1030 [ - + ]: 90 : "" : "ONLY ";
1031 : :
1032 : 90 : quoteOneName(attname, RIAttName(fk_rel, riinfo->fk_attnums[riinfo->nkeys - 1]));
1033 : 90 : sprintf(paramname, "$%d", riinfo->nkeys);
1034 : :
1035 : 90 : appendStringInfoString(&querybuf, " AND NOT coalesce(");
1036 : :
1037 : : /* Intersect the fk with the old pk range */
1038 : 90 : initStringInfo(&intersectbuf);
503 drowley@postgresql.o 1039 : 90 : appendStringInfoChar(&intersectbuf, '(');
583 peter@eisentraut.org 1040 : 90 : ri_GenerateQual(&intersectbuf, "",
1041 : : attname, fk_period_type,
1042 : 90 : riinfo->period_intersect_oper,
1043 : : paramname, pk_period_type);
503 drowley@postgresql.o 1044 : 90 : appendStringInfoChar(&intersectbuf, ')');
1045 : :
1046 : : /* Find the remaining history */
583 peter@eisentraut.org 1047 : 90 : initStringInfo(&replacementsbuf);
1048 : 90 : appendStringInfoString(&replacementsbuf, "(SELECT pg_catalog.range_agg(r) FROM ");
1049 : :
1050 : 90 : quoteOneName(periodattname, RIAttName(pk_rel, riinfo->pk_attnums[riinfo->nkeys - 1]));
1051 : 90 : quoteRelationName(pkrelname, pk_rel);
1052 : 90 : appendStringInfo(&replacementsbuf, "(SELECT y.%s r FROM %s%s y",
1053 : : periodattname, pk_only, pkrelname);
1054 : :
1055 : : /* Restrict pk rows to what matches */
1056 : 90 : querysep = "WHERE";
1057 [ + + ]: 270 : for (int i = 0; i < riinfo->nkeys; i++)
1058 : : {
1059 : 180 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
1060 : :
1061 : 180 : quoteOneName(attname,
1062 : 180 : RIAttName(pk_rel, riinfo->pk_attnums[i]));
1063 : 180 : sprintf(paramname, "$%d", i + 1);
1064 : 180 : ri_GenerateQual(&replacementsbuf, querysep,
1065 : : paramname, pk_type,
1066 : 180 : riinfo->pp_eq_oprs[i],
1067 : : attname, pk_type);
1068 : 180 : querysep = "AND";
1069 : 180 : queryoids[i] = pk_type;
1070 : : }
1071 : 90 : appendStringInfoString(&replacementsbuf, " FOR KEY SHARE OF y) y2)");
1072 : :
1073 : 90 : ri_GenerateQual(&querybuf, "",
1074 : 90 : intersectbuf.data, fk_period_type,
1075 : 90 : riinfo->agged_period_contained_by_oper,
1076 : 90 : replacementsbuf.data, ANYMULTIRANGEOID);
1077 : : /* end of coalesce: */
1078 : 90 : appendStringInfoString(&querybuf, ", false)");
1079 : : }
1080 : :
2737 1081 : 312 : appendStringInfoString(&querybuf, " FOR KEY SHARE OF x");
1082 : :
1083 : : /* Prepare and save the plan */
1084 : 312 : qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
1085 : : &qkey, fk_rel, pk_rel);
1086 : : }
1087 : :
1088 : : /*
1089 : : * We have a plan now. Run it to check for existing references.
1090 : : */
1091 : 754 : ri_PerformCheck(riinfo, &qkey, qplan,
1092 : : fk_rel, pk_rel,
1093 : : oldslot, NULL,
1094 : : !is_no_action,
1095 : : true, /* must detect new rows */
1096 : 754 : SPI_OK_SELECT);
1097 : :
1098 [ - + ]: 424 : if (SPI_finish() != SPI_OK_FINISH)
2737 peter@eisentraut.org 1099 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
1100 : :
2737 peter@eisentraut.org 1101 :CBC 424 : table_close(fk_rel, RowShareLock);
1102 : :
9586 tgl@sss.pgh.pa.us 1103 : 424 : return PointerGetDatum(NULL);
1104 : : }
1105 : :
1106 : :
1107 : : /*
1108 : : * RI_FKey_cascade_del -
1109 : : *
1110 : : * Cascaded delete foreign key references at delete event on PK table.
1111 : : */
1112 : : Datum
5182 1113 : 98 : RI_FKey_cascade_del(PG_FUNCTION_ARGS)
1114 : : {
9586 1115 : 98 : TriggerData *trigdata = (TriggerData *) fcinfo->context;
1116 : : const RI_ConstraintInfo *riinfo;
1117 : : Relation fk_rel;
1118 : : Relation pk_rel;
1119 : : TupleTableSlot *oldslot;
1120 : : RI_QueryKey qkey;
1121 : : SPIPlanPtr qplan;
1122 : :
1123 : : /* Check that this is a valid trigger call on the right time and event. */
5182 1124 : 98 : ri_CheckTrigger(fcinfo, "RI_FKey_cascade_del", RI_TRIGTYPE_DELETE);
1125 : :
5181 1126 : 98 : riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
1127 : : trigdata->tg_relation, true);
1128 : :
1129 : : /*
1130 : : * Get the relation descriptors of the FK and PK tables and the old tuple.
1131 : : *
1132 : : * fk_rel is opened in RowExclusiveLock mode since that's what our
1133 : : * eventual DELETE will get on it.
1134 : : */
2775 andres@anarazel.de 1135 : 98 : fk_rel = table_open(riinfo->fk_relid, RowExclusiveLock);
9633 bruce@momjian.us 1136 : 98 : pk_rel = trigdata->tg_relation;
2737 peter@eisentraut.org 1137 : 98 : oldslot = trigdata->tg_trigslot;
1138 : :
717 tgl@sss.pgh.pa.us 1139 : 98 : SPI_connect();
1140 : :
1141 : : /* Fetch or prepare a saved plan for the cascaded delete */
1723 peter@eisentraut.org 1142 : 98 : ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CASCADE_ONDELETE);
1143 : :
2737 1144 [ + + ]: 98 : if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
1145 : : {
1146 : : StringInfoData querybuf;
1147 : : char fkrelname[MAX_QUOTED_REL_NAME_LEN];
1148 : : char attname[MAX_QUOTED_NAME_LEN];
1149 : : char paramname[16];
1150 : : const char *querysep;
1151 : : Oid queryoids[RI_MAX_NUMKEYS];
1152 : : const char *fk_only;
1153 : :
1154 : : /* ----------
1155 : : * The query string built is
1156 : : * DELETE FROM [ONLY] <fktable> WHERE $1 = fkatt1 [AND ...]
1157 : : * The type id's for the $ parameters are those of the
1158 : : * corresponding PK attributes.
1159 : : * ----------
1160 : : */
1161 : 58 : initStringInfo(&querybuf);
1162 : 116 : fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
1163 [ + + ]: 58 : "" : "ONLY ";
1164 : 58 : quoteRelationName(fkrelname, fk_rel);
1165 : 58 : appendStringInfo(&querybuf, "DELETE FROM %s%s",
1166 : : fk_only, fkrelname);
1167 : 58 : querysep = "WHERE";
1168 [ + + ]: 128 : for (int i = 0; i < riinfo->nkeys; i++)
1169 : : {
1170 : 70 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
1171 : 70 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
1172 : :
1173 : 70 : quoteOneName(attname,
1174 : 70 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
1175 : 70 : sprintf(paramname, "$%d", i + 1);
1176 : 70 : ri_GenerateQual(&querybuf, querysep,
1177 : : paramname, pk_type,
1178 : 70 : riinfo->pf_eq_oprs[i],
1179 : : attname, fk_type);
1180 : 70 : querysep = "AND";
1181 : 70 : queryoids[i] = pk_type;
1182 : : }
1183 : :
1184 : : /* Prepare and save the plan */
1185 : 58 : qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
1186 : : &qkey, fk_rel, pk_rel);
1187 : : }
1188 : :
1189 : : /*
1190 : : * We have a plan now. Build up the arguments from the key values in the
1191 : : * deleted PK tuple and delete the referencing rows
1192 : : */
1193 : 98 : ri_PerformCheck(riinfo, &qkey, qplan,
1194 : : fk_rel, pk_rel,
1195 : : oldslot, NULL,
1196 : : false,
1197 : : true, /* must detect new rows */
1198 : : SPI_OK_DELETE);
1199 : :
1200 [ - + ]: 97 : if (SPI_finish() != SPI_OK_FINISH)
2737 peter@eisentraut.org 1201 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
1202 : :
2737 peter@eisentraut.org 1203 :CBC 97 : table_close(fk_rel, RowExclusiveLock);
1204 : :
9586 tgl@sss.pgh.pa.us 1205 : 97 : return PointerGetDatum(NULL);
1206 : : }
1207 : :
1208 : :
1209 : : /*
1210 : : * RI_FKey_cascade_upd -
1211 : : *
1212 : : * Cascaded update foreign key references at update event on PK table.
1213 : : */
1214 : : Datum
5182 1215 : 144 : RI_FKey_cascade_upd(PG_FUNCTION_ARGS)
1216 : : {
9586 1217 : 144 : TriggerData *trigdata = (TriggerData *) fcinfo->context;
1218 : : const RI_ConstraintInfo *riinfo;
1219 : : Relation fk_rel;
1220 : : Relation pk_rel;
1221 : : TupleTableSlot *newslot;
1222 : : TupleTableSlot *oldslot;
1223 : : RI_QueryKey qkey;
1224 : : SPIPlanPtr qplan;
1225 : :
1226 : : /* Check that this is a valid trigger call on the right time and event. */
5182 1227 : 144 : ri_CheckTrigger(fcinfo, "RI_FKey_cascade_upd", RI_TRIGTYPE_UPDATE);
1228 : :
5181 1229 : 144 : riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
1230 : : trigdata->tg_relation, true);
1231 : :
1232 : : /*
1233 : : * Get the relation descriptors of the FK and PK tables and the new and
1234 : : * old tuple.
1235 : : *
1236 : : * fk_rel is opened in RowExclusiveLock mode since that's what our
1237 : : * eventual UPDATE will get on it.
1238 : : */
2775 andres@anarazel.de 1239 : 144 : fk_rel = table_open(riinfo->fk_relid, RowExclusiveLock);
9633 bruce@momjian.us 1240 : 144 : pk_rel = trigdata->tg_relation;
2737 peter@eisentraut.org 1241 : 144 : newslot = trigdata->tg_newslot;
1242 : 144 : oldslot = trigdata->tg_trigslot;
1243 : :
717 tgl@sss.pgh.pa.us 1244 : 144 : SPI_connect();
1245 : :
1246 : : /* Fetch or prepare a saved plan for the cascaded update */
1723 peter@eisentraut.org 1247 : 144 : ri_BuildQueryKey(&qkey, riinfo, RI_PLAN_CASCADE_ONUPDATE);
1248 : :
2737 1249 [ + + ]: 144 : if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
1250 : : {
1251 : : StringInfoData querybuf;
1252 : : StringInfoData qualbuf;
1253 : : char fkrelname[MAX_QUOTED_REL_NAME_LEN];
1254 : : char attname[MAX_QUOTED_NAME_LEN];
1255 : : char paramname[16];
1256 : : const char *querysep;
1257 : : const char *qualsep;
1258 : : Oid queryoids[RI_MAX_NUMKEYS * 2];
1259 : : const char *fk_only;
1260 : :
1261 : : /* ----------
1262 : : * The query string built is
1263 : : * UPDATE [ONLY] <fktable> SET fkatt1 = $1 [, ...]
1264 : : * WHERE $n = fkatt1 [AND ...]
1265 : : * The type id's for the $ parameters are those of the
1266 : : * corresponding PK attributes. Note that we are assuming
1267 : : * there is an assignment cast from the PK to the FK type;
1268 : : * else the parser will fail.
1269 : : * ----------
1270 : : */
1271 : 84 : initStringInfo(&querybuf);
1272 : 84 : initStringInfo(&qualbuf);
1273 : 168 : fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
1274 [ + + ]: 84 : "" : "ONLY ";
1275 : 84 : quoteRelationName(fkrelname, fk_rel);
1276 : 84 : appendStringInfo(&querybuf, "UPDATE %s%s SET",
1277 : : fk_only, fkrelname);
1278 : 84 : querysep = "";
1279 : 84 : qualsep = "WHERE";
1280 [ + + ]: 184 : for (int i = 0, j = riinfo->nkeys; i < riinfo->nkeys; i++, j++)
1281 : : {
1282 : 100 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
1283 : 100 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
1284 : :
1285 : 100 : quoteOneName(attname,
1286 : 100 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
1287 : 100 : appendStringInfo(&querybuf,
1288 : : "%s %s = $%d",
1289 : : querysep, attname, i + 1);
1290 : 100 : sprintf(paramname, "$%d", j + 1);
1291 : 100 : ri_GenerateQual(&qualbuf, qualsep,
1292 : : paramname, pk_type,
1293 : 100 : riinfo->pf_eq_oprs[i],
1294 : : attname, fk_type);
1295 : 100 : querysep = ",";
1296 : 100 : qualsep = "AND";
1297 : 100 : queryoids[i] = pk_type;
1298 : 100 : queryoids[j] = pk_type;
1299 : : }
2592 drowley@postgresql.o 1300 : 84 : appendBinaryStringInfo(&querybuf, qualbuf.data, qualbuf.len);
1301 : :
1302 : : /* Prepare and save the plan */
2737 peter@eisentraut.org 1303 : 84 : qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys * 2, queryoids,
1304 : : &qkey, fk_rel, pk_rel);
1305 : : }
1306 : :
1307 : : /*
1308 : : * We have a plan now. Run it to update the existing references.
1309 : : */
1310 : 144 : ri_PerformCheck(riinfo, &qkey, qplan,
1311 : : fk_rel, pk_rel,
1312 : : oldslot, newslot,
1313 : : false,
1314 : : true, /* must detect new rows */
1315 : : SPI_OK_UPDATE);
1316 : :
1317 [ - + ]: 144 : if (SPI_finish() != SPI_OK_FINISH)
2737 peter@eisentraut.org 1318 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
1319 : :
2737 peter@eisentraut.org 1320 :CBC 144 : table_close(fk_rel, RowExclusiveLock);
1321 : :
9586 tgl@sss.pgh.pa.us 1322 : 144 : return PointerGetDatum(NULL);
1323 : : }
1324 : :
1325 : :
1326 : : /*
1327 : : * RI_FKey_setnull_del -
1328 : : *
1329 : : * Set foreign key references to NULL values at delete event on PK table.
1330 : : */
1331 : : Datum
1332 : 65 : RI_FKey_setnull_del(PG_FUNCTION_ARGS)
1333 : : {
1334 : : /* Check that this is a valid trigger call on the right time and event. */
3204 1335 : 65 : ri_CheckTrigger(fcinfo, "RI_FKey_setnull_del", RI_TRIGTYPE_DELETE);
1336 : :
1337 : : /* Share code with UPDATE case */
1723 peter@eisentraut.org 1338 : 65 : return ri_set((TriggerData *) fcinfo->context, true, RI_TRIGTYPE_DELETE);
1339 : : }
1340 : :
1341 : : /*
1342 : : * RI_FKey_setnull_upd -
1343 : : *
1344 : : * Set foreign key references to NULL at update event on PK table.
1345 : : */
1346 : : Datum
3204 tgl@sss.pgh.pa.us 1347 : 20 : RI_FKey_setnull_upd(PG_FUNCTION_ARGS)
1348 : : {
1349 : : /* Check that this is a valid trigger call on the right time and event. */
1350 : 20 : ri_CheckTrigger(fcinfo, "RI_FKey_setnull_upd", RI_TRIGTYPE_UPDATE);
1351 : :
1352 : : /* Share code with DELETE case */
1723 peter@eisentraut.org 1353 : 20 : return ri_set((TriggerData *) fcinfo->context, true, RI_TRIGTYPE_UPDATE);
1354 : : }
1355 : :
1356 : : /*
1357 : : * RI_FKey_setdefault_del -
1358 : : *
1359 : : * Set foreign key references to defaults at delete event on PK table.
1360 : : */
1361 : : Datum
3204 tgl@sss.pgh.pa.us 1362 : 56 : RI_FKey_setdefault_del(PG_FUNCTION_ARGS)
1363 : : {
1364 : : /* Check that this is a valid trigger call on the right time and event. */
1365 : 56 : ri_CheckTrigger(fcinfo, "RI_FKey_setdefault_del", RI_TRIGTYPE_DELETE);
1366 : :
1367 : : /* Share code with UPDATE case */
1723 peter@eisentraut.org 1368 : 56 : return ri_set((TriggerData *) fcinfo->context, false, RI_TRIGTYPE_DELETE);
1369 : : }
1370 : :
1371 : : /*
1372 : : * RI_FKey_setdefault_upd -
1373 : : *
1374 : : * Set foreign key references to defaults at update event on PK table.
1375 : : */
1376 : : Datum
3204 tgl@sss.pgh.pa.us 1377 : 32 : RI_FKey_setdefault_upd(PG_FUNCTION_ARGS)
1378 : : {
1379 : : /* Check that this is a valid trigger call on the right time and event. */
1380 : 32 : ri_CheckTrigger(fcinfo, "RI_FKey_setdefault_upd", RI_TRIGTYPE_UPDATE);
1381 : :
1382 : : /* Share code with DELETE case */
1723 peter@eisentraut.org 1383 : 32 : return ri_set((TriggerData *) fcinfo->context, false, RI_TRIGTYPE_UPDATE);
1384 : : }
1385 : :
1386 : : /*
1387 : : * ri_set -
1388 : : *
1389 : : * Common code for ON DELETE SET NULL, ON DELETE SET DEFAULT, ON UPDATE SET
1390 : : * NULL, and ON UPDATE SET DEFAULT.
1391 : : */
1392 : : static Datum
1393 : 173 : ri_set(TriggerData *trigdata, bool is_set_null, int tgkind)
1394 : : {
1395 : : const RI_ConstraintInfo *riinfo;
1396 : : Relation fk_rel;
1397 : : Relation pk_rel;
1398 : : TupleTableSlot *oldslot;
1399 : : RI_QueryKey qkey;
1400 : : SPIPlanPtr qplan;
1401 : : int32 queryno;
1402 : :
5181 tgl@sss.pgh.pa.us 1403 : 173 : riinfo = ri_FetchConstraintInfo(trigdata->tg_trigger,
1404 : : trigdata->tg_relation, true);
1405 : :
1406 : : /*
1407 : : * Get the relation descriptors of the FK and PK tables and the old tuple.
1408 : : *
1409 : : * fk_rel is opened in RowExclusiveLock mode since that's what our
1410 : : * eventual UPDATE will get on it.
1411 : : */
2775 andres@anarazel.de 1412 : 173 : fk_rel = table_open(riinfo->fk_relid, RowExclusiveLock);
9633 bruce@momjian.us 1413 : 173 : pk_rel = trigdata->tg_relation;
2737 peter@eisentraut.org 1414 : 173 : oldslot = trigdata->tg_trigslot;
1415 : :
717 tgl@sss.pgh.pa.us 1416 : 173 : SPI_connect();
1417 : :
1418 : : /*
1419 : : * Fetch or prepare a saved plan for the trigger.
1420 : : */
1568 1421 [ + + - ]: 173 : switch (tgkind)
1422 : : {
1723 peter@eisentraut.org 1423 : 52 : case RI_TRIGTYPE_UPDATE:
1424 : 52 : queryno = is_set_null
1425 : : ? RI_PLAN_SETNULL_ONUPDATE
1426 [ + + ]: 52 : : RI_PLAN_SETDEFAULT_ONUPDATE;
1427 : 52 : break;
1428 : 121 : case RI_TRIGTYPE_DELETE:
1429 : 121 : queryno = is_set_null
1430 : : ? RI_PLAN_SETNULL_ONDELETE
1431 [ + + ]: 121 : : RI_PLAN_SETDEFAULT_ONDELETE;
1432 : 121 : break;
1723 peter@eisentraut.org 1433 :UBC 0 : default:
1434 [ # # ]: 0 : elog(ERROR, "invalid tgkind passed to ri_set");
1435 : : }
1436 : :
1723 peter@eisentraut.org 1437 :CBC 173 : ri_BuildQueryKey(&qkey, riinfo, queryno);
1438 : :
2737 1439 [ + + ]: 173 : if ((qplan = ri_FetchPreparedPlan(&qkey)) == NULL)
1440 : : {
1441 : : StringInfoData querybuf;
1442 : : char fkrelname[MAX_QUOTED_REL_NAME_LEN];
1443 : : char attname[MAX_QUOTED_NAME_LEN];
1444 : : char paramname[16];
1445 : : const char *querysep;
1446 : : const char *qualsep;
1447 : : Oid queryoids[RI_MAX_NUMKEYS];
1448 : : const char *fk_only;
1449 : : int num_cols_to_set;
1450 : : const int16 *set_cols;
1451 : :
1568 tgl@sss.pgh.pa.us 1452 [ + + - ]: 97 : switch (tgkind)
1453 : : {
1723 peter@eisentraut.org 1454 : 32 : case RI_TRIGTYPE_UPDATE:
1455 : 32 : num_cols_to_set = riinfo->nkeys;
1456 : 32 : set_cols = riinfo->fk_attnums;
1457 : 32 : break;
1458 : 65 : case RI_TRIGTYPE_DELETE:
1459 : :
1460 : : /*
1461 : : * If confdelsetcols are present, then we only update the
1462 : : * columns specified in that array, otherwise we update all
1463 : : * the referencing columns.
1464 : : */
1568 tgl@sss.pgh.pa.us 1465 [ + + ]: 65 : if (riinfo->ndelsetcols != 0)
1466 : : {
1723 peter@eisentraut.org 1467 : 16 : num_cols_to_set = riinfo->ndelsetcols;
1468 : 16 : set_cols = riinfo->confdelsetcols;
1469 : : }
1470 : : else
1471 : : {
1472 : 49 : num_cols_to_set = riinfo->nkeys;
1473 : 49 : set_cols = riinfo->fk_attnums;
1474 : : }
1475 : 65 : break;
1723 peter@eisentraut.org 1476 :UBC 0 : default:
1477 [ # # ]: 0 : elog(ERROR, "invalid tgkind passed to ri_set");
1478 : : }
1479 : :
1480 : : /* ----------
1481 : : * The query string built is
1482 : : * UPDATE [ONLY] <fktable> SET fkatt1 = {NULL|DEFAULT} [, ...]
1483 : : * WHERE $1 = fkatt1 [AND ...]
1484 : : * The type id's for the $ parameters are those of the
1485 : : * corresponding PK attributes.
1486 : : * ----------
1487 : : */
2737 peter@eisentraut.org 1488 :CBC 97 : initStringInfo(&querybuf);
1489 : 194 : fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
1490 [ + + ]: 97 : "" : "ONLY ";
1491 : 97 : quoteRelationName(fkrelname, fk_rel);
1492 : 97 : appendStringInfo(&querybuf, "UPDATE %s%s SET",
1493 : : fk_only, fkrelname);
1494 : :
1495 : : /*
1496 : : * Add assignment clauses
1497 : : */
1498 : 97 : querysep = "";
1723 1499 [ + + ]: 254 : for (int i = 0; i < num_cols_to_set; i++)
1500 : : {
1501 : 157 : quoteOneName(attname, RIAttName(fk_rel, set_cols[i]));
1502 [ + + ]: 157 : appendStringInfo(&querybuf,
1503 : : "%s %s = %s",
1504 : : querysep, attname,
1505 : : is_set_null ? "NULL" : "DEFAULT");
1506 : 157 : querysep = ",";
1507 : : }
1508 : :
1509 : : /*
1510 : : * Add WHERE clause
1511 : : */
2737 1512 : 97 : qualsep = "WHERE";
1513 [ + + ]: 270 : for (int i = 0; i < riinfo->nkeys; i++)
1514 : : {
1515 : 173 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
1516 : 173 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
1517 : :
1518 : 173 : quoteOneName(attname,
1519 : 173 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
1520 : :
1521 : 173 : sprintf(paramname, "$%d", i + 1);
1723 1522 : 173 : ri_GenerateQual(&querybuf, qualsep,
1523 : : paramname, pk_type,
2737 1524 : 173 : riinfo->pf_eq_oprs[i],
1525 : : attname, fk_type);
1526 : 173 : qualsep = "AND";
1527 : 173 : queryoids[i] = pk_type;
1528 : : }
1529 : :
1530 : : /* Prepare and save the plan */
1531 : 97 : qplan = ri_PlanCheck(querybuf.data, riinfo->nkeys, queryoids,
1532 : : &qkey, fk_rel, pk_rel);
1533 : : }
1534 : :
1535 : : /*
1536 : : * We have a plan now. Run it to update the existing references.
1537 : : */
1538 : 173 : ri_PerformCheck(riinfo, &qkey, qplan,
1539 : : fk_rel, pk_rel,
1540 : : oldslot, NULL,
1541 : : false,
1542 : : true, /* must detect new rows */
1543 : : SPI_OK_UPDATE);
1544 : :
1545 [ - + ]: 172 : if (SPI_finish() != SPI_OK_FINISH)
2737 peter@eisentraut.org 1546 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
1547 : :
2737 peter@eisentraut.org 1548 :CBC 172 : table_close(fk_rel, RowExclusiveLock);
1549 : :
1550 [ + + ]: 172 : if (is_set_null)
1551 : 84 : return PointerGetDatum(NULL);
1552 : : else
1553 : : {
1554 : : /*
1555 : : * If we just deleted or updated the PK row whose key was equal to the
1556 : : * FK columns' default values, and a referencing row exists in the FK
1557 : : * table, we would have updated that row to the same values it already
1558 : : * had --- and RI_FKey_fk_upd_check_required would hence believe no
1559 : : * check is necessary. So we need to do another lookup now and in
1560 : : * case a reference still exists, abort the operation. That is
1561 : : * already implemented in the NO ACTION trigger, so just run it. (This
1562 : : * recheck is only needed in the SET DEFAULT case, since CASCADE would
1563 : : * remove such rows in case of a DELETE operation or would change the
1564 : : * FK key values in case of an UPDATE, while SET NULL is certain to
1565 : : * result in rows that satisfy the FK constraint.)
1566 : : */
1567 : 88 : return ri_restrict(trigdata, true);
1568 : : }
1569 : : }
1570 : :
1571 : :
1572 : : /*
1573 : : * RI_FKey_pk_upd_check_required -
1574 : : *
1575 : : * Check if we really need to fire the RI trigger for an update or delete to a PK
1576 : : * relation. This is called by the AFTER trigger queue manager to see if
1577 : : * it can skip queuing an instance of an RI trigger. Returns true if the
1578 : : * trigger must be fired, false if we can prove the constraint will still
1579 : : * be satisfied.
1580 : : *
1581 : : * newslot will be NULL if this is called for a delete.
1582 : : */
1583 : : bool
5182 tgl@sss.pgh.pa.us 1584 : 1540 : RI_FKey_pk_upd_check_required(Trigger *trigger, Relation pk_rel,
1585 : : TupleTableSlot *oldslot, TupleTableSlot *newslot)
1586 : : {
1587 : : const RI_ConstraintInfo *riinfo;
1588 : :
5181 1589 : 1540 : riinfo = ri_FetchConstraintInfo(trigger, pk_rel, true);
1590 : :
1591 : : /*
1592 : : * If any old key value is NULL, the row could not have been referenced by
1593 : : * an FK row, so no check is needed.
1594 : : */
2737 peter@eisentraut.org 1595 [ + + ]: 1540 : if (ri_NullCheck(RelationGetDescr(pk_rel), oldslot, riinfo, true) != RI_KEYS_NONE_NULL)
1596 : 4 : return false;
1597 : :
1598 : : /* If all old and new key values are equal, no check is needed */
1599 [ + + + + ]: 1536 : if (newslot && ri_KeysEqual(pk_rel, oldslot, newslot, riinfo, true))
1600 : 288 : return false;
1601 : :
1602 : : /* Else we need to fire the trigger. */
1603 : 1248 : return true;
1604 : : }
1605 : :
1606 : : /*
1607 : : * RI_FKey_fk_upd_check_required -
1608 : : *
1609 : : * Check if we really need to fire the RI trigger for an update to an FK
1610 : : * relation. This is called by the AFTER trigger queue manager to see if
1611 : : * it can skip queuing an instance of an RI trigger. Returns true if the
1612 : : * trigger must be fired, false if we can prove the constraint will still
1613 : : * be satisfied.
1614 : : */
1615 : : bool
5182 tgl@sss.pgh.pa.us 1616 : 670 : RI_FKey_fk_upd_check_required(Trigger *trigger, Relation fk_rel,
1617 : : TupleTableSlot *oldslot, TupleTableSlot *newslot)
1618 : : {
1619 : : const RI_ConstraintInfo *riinfo;
1620 : : int ri_nullcheck;
1621 : :
1622 : : /*
1623 : : * AfterTriggerSaveEvent() handles things such that this function is never
1624 : : * called for partitioned tables.
1625 : : */
1621 alvherre@alvh.no-ip. 1626 [ - + ]: 670 : Assert(fk_rel->rd_rel->relkind != RELKIND_PARTITIONED_TABLE);
1627 : :
5181 tgl@sss.pgh.pa.us 1628 : 670 : riinfo = ri_FetchConstraintInfo(trigger, fk_rel, false);
1629 : :
2737 peter@eisentraut.org 1630 : 670 : ri_nullcheck = ri_NullCheck(RelationGetDescr(fk_rel), newslot, riinfo, false);
1631 : :
1632 : : /*
1633 : : * If all new key values are NULL, the row satisfies the constraint, so no
1634 : : * check is needed.
1635 : : */
1636 [ + + ]: 670 : if (ri_nullcheck == RI_KEYS_ALL_NULL)
1637 : 84 : return false;
1638 : :
1639 : : /*
1640 : : * If some new key values are NULL, the behavior depends on the match
1641 : : * type.
1642 : : */
1643 [ + + ]: 586 : else if (ri_nullcheck == RI_KEYS_SOME_NULL)
1644 : : {
1645 [ + - + - ]: 20 : switch (riinfo->confmatchtype)
1646 : : {
1647 : 16 : case FKCONSTR_MATCH_SIMPLE:
1648 : :
1649 : : /*
1650 : : * If any new key value is NULL, the row must satisfy the
1651 : : * constraint, so no check is needed.
1652 : : */
5182 tgl@sss.pgh.pa.us 1653 : 16 : return false;
1654 : :
2737 peter@eisentraut.org 1655 :UBC 0 : case FKCONSTR_MATCH_PARTIAL:
1656 : :
1657 : : /*
1658 : : * Don't know, must run full check.
1659 : : */
1660 : 0 : break;
1661 : :
2737 peter@eisentraut.org 1662 :CBC 4 : case FKCONSTR_MATCH_FULL:
1663 : :
1664 : : /*
1665 : : * If some new key values are NULL, the row fails the
1666 : : * constraint. We must not throw error here, because the row
1667 : : * might get invalidated before the constraint is to be
1668 : : * checked, but we should queue the event to apply the check
1669 : : * later.
1670 : : */
5182 tgl@sss.pgh.pa.us 1671 : 4 : return true;
1672 : : }
1673 : : }
1674 : :
1675 : : /*
1676 : : * Continues here for no new key values are NULL, or we couldn't decide
1677 : : * yet.
1678 : : */
1679 : :
1680 : : /*
1681 : : * If the original row was inserted by our own transaction, we must fire
1682 : : * the trigger whether or not the keys are equal. This is because our
1683 : : * UPDATE will invalidate the INSERT so that the INSERT RI trigger will
1684 : : * not do anything; so we had better do the UPDATE check. (We could skip
1685 : : * this if we knew the INSERT trigger already fired, but there is no easy
1686 : : * way to know that.)
1687 : : */
889 akorotkov@postgresql 1688 [ + + ]: 566 : if (slot_is_current_xact_tuple(oldslot))
2737 peter@eisentraut.org 1689 : 77 : return true;
1690 : :
1691 : : /* If all old and new key values are equal, no check is needed */
1692 [ + + ]: 489 : if (ri_KeysEqual(fk_rel, oldslot, newslot, riinfo, false))
1693 : 262 : return false;
1694 : :
1695 : : /* Else we need to fire the trigger. */
1696 : 227 : return true;
1697 : : }
1698 : :
1699 : : /*
1700 : : * RI_Initial_Check -
1701 : : *
1702 : : * Check an entire table for non-matching values using a single query.
1703 : : * This is not a trigger procedure, but is called during ALTER TABLE
1704 : : * ADD FOREIGN KEY to validate the initial table contents.
1705 : : *
1706 : : * We expect that the caller has made provision to prevent any problems
1707 : : * caused by concurrent actions. This could be either by locking rel and
1708 : : * pkrel at ShareRowExclusiveLock or higher, or by otherwise ensuring
1709 : : * that triggers implementing the checks are already active.
1710 : : * Hence, we do not need to lock individual rows for the check.
1711 : : *
1712 : : * If the check fails because the current user doesn't have permissions
1713 : : * to read both tables, return false to let our caller know that they will
1714 : : * need to do something else to check the constraint.
1715 : : */
1716 : : bool
7134 tgl@sss.pgh.pa.us 1717 : 765 : RI_Initial_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
1718 : : {
1719 : : const RI_ConstraintInfo *riinfo;
1720 : : StringInfoData querybuf;
1721 : : char pkrelname[MAX_QUOTED_REL_NAME_LEN];
1722 : : char fkrelname[MAX_QUOTED_REL_NAME_LEN];
1723 : : char pkattname[MAX_QUOTED_NAME_LEN + 3];
1724 : : char fkattname[MAX_QUOTED_NAME_LEN + 3];
1725 : : RangeTblEntry *rte;
1726 : : RTEPermissionInfo *pk_perminfo;
1727 : : RTEPermissionInfo *fk_perminfo;
1211 alvherre@alvh.no-ip. 1728 : 765 : List *rtes = NIL;
1729 : 765 : List *perminfos = NIL;
1730 : : const char *sep;
1731 : : const char *fk_only;
1732 : : const char *pk_only;
1733 : : int save_nestlevel;
1734 : : char workmembuf[32];
1735 : : int spi_result;
1736 : : SPIPlanPtr qplan;
1737 : :
5181 tgl@sss.pgh.pa.us 1738 : 765 : riinfo = ri_FetchConstraintInfo(trigger, fk_rel, false);
1739 : :
1740 : : /*
1741 : : * Check to make sure current user has enough permissions to do the test
1742 : : * query. (If not, caller can fall back to the trigger method, which
1743 : : * works because it changes user IDs on the fly.)
1744 : : *
1745 : : * XXX are there any other show-stopper conditions to check?
1746 : : */
1360 alvherre@alvh.no-ip. 1747 : 765 : pk_perminfo = makeNode(RTEPermissionInfo);
1748 : 765 : pk_perminfo->relid = RelationGetRelid(pk_rel);
1749 : 765 : pk_perminfo->requiredPerms = ACL_SELECT;
1211 1750 : 765 : perminfos = lappend(perminfos, pk_perminfo);
1751 : 765 : rte = makeNode(RangeTblEntry);
1752 : 765 : rte->rtekind = RTE_RELATION;
1753 : 765 : rte->relid = RelationGetRelid(pk_rel);
1754 : 765 : rte->relkind = pk_rel->rd_rel->relkind;
1755 : 765 : rte->rellockmode = AccessShareLock;
1756 : 765 : rte->perminfoindex = list_length(perminfos);
1757 : 765 : rtes = lappend(rtes, rte);
1758 : :
1360 1759 : 765 : fk_perminfo = makeNode(RTEPermissionInfo);
1760 : 765 : fk_perminfo->relid = RelationGetRelid(fk_rel);
1761 : 765 : fk_perminfo->requiredPerms = ACL_SELECT;
1211 1762 : 765 : perminfos = lappend(perminfos, fk_perminfo);
1763 : 765 : rte = makeNode(RangeTblEntry);
1764 : 765 : rte->rtekind = RTE_RELATION;
1765 : 765 : rte->relid = RelationGetRelid(fk_rel);
1766 : 765 : rte->relkind = fk_rel->rd_rel->relkind;
1767 : 765 : rte->rellockmode = AccessShareLock;
1768 : 765 : rte->perminfoindex = list_length(perminfos);
1769 : 765 : rtes = lappend(rtes, rte);
1770 : :
2737 peter@eisentraut.org 1771 [ + + ]: 1799 : for (int i = 0; i < riinfo->nkeys; i++)
1772 : : {
1773 : : int attno;
1774 : :
5181 tgl@sss.pgh.pa.us 1775 : 1034 : attno = riinfo->pk_attnums[i] - FirstLowInvalidHeapAttributeNumber;
1360 alvherre@alvh.no-ip. 1776 : 1034 : pk_perminfo->selectedCols = bms_add_member(pk_perminfo->selectedCols, attno);
1777 : :
5181 tgl@sss.pgh.pa.us 1778 : 1034 : attno = riinfo->fk_attnums[i] - FirstLowInvalidHeapAttributeNumber;
1360 alvherre@alvh.no-ip. 1779 : 1034 : fk_perminfo->selectedCols = bms_add_member(fk_perminfo->selectedCols, attno);
1780 : : }
1781 : :
1211 1782 [ + + ]: 765 : if (!ExecCheckPermissions(rtes, perminfos, false))
5880 rhaas@postgresql.org 1783 : 8 : return false;
1784 : :
1785 : : /*
1786 : : * Also punt if RLS is enabled on either table unless this role has the
1787 : : * bypassrls right or is the table owner of the table(s) involved which
1788 : : * have RLS enabled.
1789 : : */
4265 alvherre@alvh.no-ip. 1790 [ + + ]: 757 : if (!has_bypassrls_privilege(GetUserId()) &&
4355 sfrost@snowman.net 1791 [ + - ]: 4 : ((pk_rel->rd_rel->relrowsecurity &&
1211 alvherre@alvh.no-ip. 1792 [ - + ]: 4 : !object_ownercheck(RelationRelationId, RelationGetRelid(pk_rel),
1211 alvherre@alvh.no-ip. 1793 :UBC 0 : GetUserId())) ||
4355 sfrost@snowman.net 1794 [ # # ]: 0 : (fk_rel->rd_rel->relrowsecurity &&
1211 alvherre@alvh.no-ip. 1795 [ # # ]: 0 : !object_ownercheck(RelationRelationId, RelationGetRelid(fk_rel),
1796 : : GetUserId()))))
4360 sfrost@snowman.net 1797 :CBC 4 : return false;
1798 : :
1799 : : /*----------
1800 : : * The query string built is:
1801 : : * SELECT fk.keycols FROM [ONLY] relname fk
1802 : : * LEFT OUTER JOIN [ONLY] pkrelname pk
1803 : : * ON (pk.pkkeycol1=fk.keycol1 [AND ...])
1804 : : * WHERE pk.pkkeycol1 IS NULL AND
1805 : : * For MATCH SIMPLE:
1806 : : * (fk.keycol1 IS NOT NULL [AND ...])
1807 : : * For MATCH FULL:
1808 : : * (fk.keycol1 IS NOT NULL [OR ...])
1809 : : *
1810 : : * We attach COLLATE clauses to the operators when comparing columns
1811 : : * that have different collations.
1812 : : *----------
1813 : : */
7134 tgl@sss.pgh.pa.us 1814 : 753 : initStringInfo(&querybuf);
4683 rhaas@postgresql.org 1815 : 753 : appendStringInfoString(&querybuf, "SELECT ");
8033 bruce@momjian.us 1816 : 753 : sep = "";
2737 peter@eisentraut.org 1817 [ + + ]: 1767 : for (int i = 0; i < riinfo->nkeys; i++)
1818 : : {
7134 tgl@sss.pgh.pa.us 1819 : 1014 : quoteOneName(fkattname,
5181 1820 : 1014 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
7134 1821 : 1014 : appendStringInfo(&querybuf, "%sfk.%s", sep, fkattname);
8361 1822 : 1014 : sep = ", ";
1823 : : }
1824 : :
7134 1825 : 753 : quoteRelationName(pkrelname, pk_rel);
1826 : 753 : quoteRelationName(fkrelname, fk_rel);
3067 alvherre@alvh.no-ip. 1827 : 1506 : fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
1828 [ - + ]: 753 : "" : "ONLY ";
2703 1829 : 1506 : pk_only = pk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
1830 [ + + ]: 753 : "" : "ONLY ";
7134 tgl@sss.pgh.pa.us 1831 : 753 : appendStringInfo(&querybuf,
1832 : : " FROM %s%s fk LEFT OUTER JOIN %s%s pk ON",
1833 : : fk_only, fkrelname, pk_only, pkrelname);
1834 : :
1835 : 753 : strcpy(pkattname, "pk.");
1836 : 753 : strcpy(fkattname, "fk.");
1837 : 753 : sep = "(";
2737 peter@eisentraut.org 1838 [ + + ]: 1767 : for (int i = 0; i < riinfo->nkeys; i++)
1839 : : {
5181 tgl@sss.pgh.pa.us 1840 : 1014 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
1841 : 1014 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
1842 : 1014 : Oid pk_coll = RIAttCollation(pk_rel, riinfo->pk_attnums[i]);
1843 : 1014 : Oid fk_coll = RIAttCollation(fk_rel, riinfo->fk_attnums[i]);
1844 : :
7134 1845 : 1014 : quoteOneName(pkattname + 3,
5181 1846 : 1014 : RIAttName(pk_rel, riinfo->pk_attnums[i]));
7134 1847 : 1014 : quoteOneName(fkattname + 3,
5181 1848 : 1014 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
7134 1849 : 1014 : ri_GenerateQual(&querybuf, sep,
1850 : : pkattname, pk_type,
5181 1851 : 1014 : riinfo->pf_eq_oprs[i],
1852 : : fkattname, fk_type);
5617 1853 [ + + ]: 1014 : if (pk_coll != fk_coll)
1854 : 8 : ri_GenerateQualCollation(&querybuf, pk_coll);
7134 1855 : 1014 : sep = "AND";
1856 : : }
1857 : :
1858 : : /*
1859 : : * It's sufficient to test any one pk attribute for null to detect a join
1860 : : * failure.
1861 : : */
5181 1862 : 753 : quoteOneName(pkattname, RIAttName(pk_rel, riinfo->pk_attnums[0]));
7134 1863 : 753 : appendStringInfo(&querybuf, ") WHERE pk.%s IS NULL AND (", pkattname);
1864 : :
8033 bruce@momjian.us 1865 : 753 : sep = "";
2737 peter@eisentraut.org 1866 [ + + ]: 1767 : for (int i = 0; i < riinfo->nkeys; i++)
1867 : : {
5181 tgl@sss.pgh.pa.us 1868 : 1014 : quoteOneName(fkattname, RIAttName(fk_rel, riinfo->fk_attnums[i]));
7134 1869 : 1014 : appendStringInfo(&querybuf,
1870 : : "%sfk.%s IS NOT NULL",
1871 : : sep, fkattname);
5181 1872 [ + + - ]: 1014 : switch (riinfo->confmatchtype)
1873 : : {
5184 1874 : 940 : case FKCONSTR_MATCH_SIMPLE:
8033 bruce@momjian.us 1875 : 940 : sep = " AND ";
8361 tgl@sss.pgh.pa.us 1876 : 940 : break;
1877 : 74 : case FKCONSTR_MATCH_FULL:
8033 bruce@momjian.us 1878 : 74 : sep = " OR ";
8361 tgl@sss.pgh.pa.us 1879 : 74 : break;
1880 : : }
1881 : : }
4683 rhaas@postgresql.org 1882 : 753 : appendStringInfoChar(&querybuf, ')');
1883 : :
1884 : : /*
1885 : : * Temporarily increase work_mem so that the check query can be executed
1886 : : * more efficiently. It seems okay to do this because the query is simple
1887 : : * enough to not use a multiple of work_mem, and one typically would not
1888 : : * have many large foreign-key validations happening concurrently. So
1889 : : * this seems to meet the criteria for being considered a "maintenance"
1890 : : * operation, and accordingly we use maintenance_work_mem. However, we
1891 : : * must also set hash_mem_multiplier to 1, since it is surely not okay to
1892 : : * let that get applied to the maintenance_work_mem value.
1893 : : *
1894 : : * We use the equivalent of a function SET option to allow the setting to
1895 : : * persist for exactly the duration of the check query. guc.c also takes
1896 : : * care of undoing the setting on error.
1897 : : */
5440 tgl@sss.pgh.pa.us 1898 : 753 : save_nestlevel = NewGUCNestLevel();
1899 : :
8241 1900 : 753 : snprintf(workmembuf, sizeof(workmembuf), "%d", maintenance_work_mem);
1901 : 753 : (void) set_config_option("work_mem", workmembuf,
1902 : : PGC_USERSET, PGC_S_SESSION,
1903 : : GUC_ACTION_SAVE, true, 0, false);
2220 pg@bowt.ie 1904 : 753 : (void) set_config_option("hash_mem_multiplier", "1",
1905 : : PGC_USERSET, PGC_S_SESSION,
1906 : : GUC_ACTION_SAVE, true, 0, false);
1907 : :
717 tgl@sss.pgh.pa.us 1908 : 753 : SPI_connect();
1909 : :
1910 : : /*
1911 : : * Generate the plan. We don't need to cache it, and there are no
1912 : : * arguments to the plan.
1913 : : */
7134 1914 : 753 : qplan = SPI_prepare(querybuf.data, 0, NULL);
1915 : :
8361 1916 [ - + ]: 753 : if (qplan == NULL)
3284 peter_e@gmx.net 1917 [ # # ]:UBC 0 : elog(ERROR, "SPI_prepare returned %s for %s",
1918 : : SPI_result_code_string(SPI_result), querybuf.data);
1919 : :
1920 : : /*
1921 : : * Run the plan. For safety we force a current snapshot to be used. (In
1922 : : * transaction-snapshot mode, this arguably violates transaction isolation
1923 : : * rules, but we really haven't got much choice.) We don't need to
1924 : : * register the snapshot, because SPI_execute_snapshot will see to it. We
1925 : : * need at most one tuple returned, so pass limit = 1.
1926 : : */
8018 tgl@sss.pgh.pa.us 1927 :CBC 753 : spi_result = SPI_execute_snapshot(qplan,
1928 : : NULL, NULL,
1929 : : GetLatestSnapshot(),
1930 : : InvalidSnapshot,
1931 : : true, false, 1);
1932 : :
1933 : : /* Check result */
8361 1934 [ - + ]: 753 : if (spi_result != SPI_OK_SELECT)
3284 peter_e@gmx.net 1935 [ # # ]:UBC 0 : elog(ERROR, "SPI_execute_snapshot returned %s", SPI_result_code_string(spi_result));
1936 : :
1937 : : /* Did we find a tuple violating the constraint? */
8361 tgl@sss.pgh.pa.us 1938 [ + + ]:CBC 753 : if (SPI_processed > 0)
1939 : : {
1940 : : TupleTableSlot *slot;
1941 : 51 : HeapTuple tuple = SPI_tuptable->vals[0];
1942 : 51 : TupleDesc tupdesc = SPI_tuptable->tupdesc;
1943 : : RI_ConstraintInfo fake_riinfo;
1944 : :
2739 andres@anarazel.de 1945 : 51 : slot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsVirtual);
1946 : :
1947 : 51 : heap_deform_tuple(tuple, tupdesc,
1948 : : slot->tts_values, slot->tts_isnull);
1949 : 51 : ExecStoreVirtualTuple(slot);
1950 : :
1951 : : /*
1952 : : * The columns to look at in the result tuple are 1..N, not whatever
1953 : : * they are in the fk_rel. Hack up riinfo so that the subroutines
1954 : : * called here will behave properly.
1955 : : *
1956 : : * In addition to this, we have to pass the correct tupdesc to
1957 : : * ri_ReportViolation, overriding its normal habit of using the pk_rel
1958 : : * or fk_rel's tupdesc.
1959 : : */
5181 tgl@sss.pgh.pa.us 1960 : 51 : memcpy(&fake_riinfo, riinfo, sizeof(RI_ConstraintInfo));
2737 peter@eisentraut.org 1961 [ + + ]: 118 : for (int i = 0; i < fake_riinfo.nkeys; i++)
5181 tgl@sss.pgh.pa.us 1962 : 67 : fake_riinfo.fk_attnums[i] = i + 1;
1963 : :
1964 : : /*
1965 : : * If it's MATCH FULL, and there are any nulls in the FK keys,
1966 : : * complain about that rather than the lack of a match. MATCH FULL
1967 : : * disallows partially-null FK rows.
1968 : : */
1969 [ + + + + ]: 71 : if (fake_riinfo.confmatchtype == FKCONSTR_MATCH_FULL &&
2739 andres@anarazel.de 1970 : 20 : ri_NullCheck(tupdesc, slot, &fake_riinfo, false) != RI_KEYS_NONE_NULL)
5183 tgl@sss.pgh.pa.us 1971 [ + - ]: 8 : ereport(ERROR,
1972 : : (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
1973 : : errmsg("insert or update on table \"%s\" violates foreign key constraint \"%s\"",
1974 : : RelationGetRelationName(fk_rel),
1975 : : NameStr(fake_riinfo.conname)),
1976 : : errdetail("MATCH FULL does not allow mixing of null and nonnull key values."),
1977 : : errtableconstraint(fk_rel,
1978 : : NameStr(fake_riinfo.conname))));
1979 : :
1980 : : /*
1981 : : * We tell ri_ReportViolation we were doing the RI_PLAN_CHECK_LOOKUPPK
1982 : : * query, which isn't true, but will cause it to use
1983 : : * fake_riinfo.fk_attnums as we need.
1984 : : */
5181 1985 : 43 : ri_ReportViolation(&fake_riinfo,
1986 : : pk_rel, fk_rel,
1987 : : slot, tupdesc,
1988 : : RI_PLAN_CHECK_LOOKUPPK, false, false);
1989 : :
1990 : : ExecDropSingleTupleTableSlot(slot);
1991 : : }
1992 : :
8361 1993 [ - + ]: 702 : if (SPI_finish() != SPI_OK_FINISH)
8361 tgl@sss.pgh.pa.us 1994 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
1995 : :
1996 : : /*
1997 : : * Restore work_mem and hash_mem_multiplier.
1998 : : */
5440 tgl@sss.pgh.pa.us 1999 :CBC 702 : AtEOXact_GUC(true, save_nestlevel);
2000 : :
8361 2001 : 702 : return true;
2002 : : }
2003 : :
2004 : : /*
2005 : : * RI_PartitionRemove_Check -
2006 : : *
2007 : : * Verify no referencing values exist, when a partition is detached on
2008 : : * the referenced side of a foreign key constraint.
2009 : : */
2010 : : void
2703 alvherre@alvh.no-ip. 2011 : 65 : RI_PartitionRemove_Check(Trigger *trigger, Relation fk_rel, Relation pk_rel)
2012 : : {
2013 : : const RI_ConstraintInfo *riinfo;
2014 : : StringInfoData querybuf;
2015 : : char *constraintDef;
2016 : : char pkrelname[MAX_QUOTED_REL_NAME_LEN];
2017 : : char fkrelname[MAX_QUOTED_REL_NAME_LEN];
2018 : : char pkattname[MAX_QUOTED_NAME_LEN + 3];
2019 : : char fkattname[MAX_QUOTED_NAME_LEN + 3];
2020 : : const char *sep;
2021 : : const char *fk_only;
2022 : : int save_nestlevel;
2023 : : char workmembuf[32];
2024 : : int spi_result;
2025 : : SPIPlanPtr qplan;
2026 : : int i;
2027 : :
2028 : 65 : riinfo = ri_FetchConstraintInfo(trigger, fk_rel, false);
2029 : :
2030 : : /*
2031 : : * We don't check permissions before displaying the error message, on the
2032 : : * assumption that the user detaching the partition must have enough
2033 : : * privileges to examine the table contents anyhow.
2034 : : */
2035 : :
2036 : : /*----------
2037 : : * The query string built is:
2038 : : * SELECT fk.keycols FROM [ONLY] relname fk
2039 : : * JOIN pkrelname pk
2040 : : * ON (pk.pkkeycol1=fk.keycol1 [AND ...])
2041 : : * WHERE (<partition constraint>) AND
2042 : : * For MATCH SIMPLE:
2043 : : * (fk.keycol1 IS NOT NULL [AND ...])
2044 : : * For MATCH FULL:
2045 : : * (fk.keycol1 IS NOT NULL [OR ...])
2046 : : *
2047 : : * We attach COLLATE clauses to the operators when comparing columns
2048 : : * that have different collations.
2049 : : *----------
2050 : : */
2051 : 65 : initStringInfo(&querybuf);
2052 : 65 : appendStringInfoString(&querybuf, "SELECT ");
2053 : 65 : sep = "";
2054 [ + + ]: 130 : for (i = 0; i < riinfo->nkeys; i++)
2055 : : {
2056 : 65 : quoteOneName(fkattname,
2057 : 65 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
2058 : 65 : appendStringInfo(&querybuf, "%sfk.%s", sep, fkattname);
2059 : 65 : sep = ", ";
2060 : : }
2061 : :
2062 : 65 : quoteRelationName(pkrelname, pk_rel);
2063 : 65 : quoteRelationName(fkrelname, fk_rel);
2064 : 130 : fk_only = fk_rel->rd_rel->relkind == RELKIND_PARTITIONED_TABLE ?
2065 [ + + ]: 65 : "" : "ONLY ";
2066 : 65 : appendStringInfo(&querybuf,
2067 : : " FROM %s%s fk JOIN %s pk ON",
2068 : : fk_only, fkrelname, pkrelname);
2069 : 65 : strcpy(pkattname, "pk.");
2070 : 65 : strcpy(fkattname, "fk.");
2071 : 65 : sep = "(";
2072 [ + + ]: 130 : for (i = 0; i < riinfo->nkeys; i++)
2073 : : {
2074 : 65 : Oid pk_type = RIAttType(pk_rel, riinfo->pk_attnums[i]);
2075 : 65 : Oid fk_type = RIAttType(fk_rel, riinfo->fk_attnums[i]);
2076 : 65 : Oid pk_coll = RIAttCollation(pk_rel, riinfo->pk_attnums[i]);
2077 : 65 : Oid fk_coll = RIAttCollation(fk_rel, riinfo->fk_attnums[i]);
2078 : :
2079 : 65 : quoteOneName(pkattname + 3,
2080 : 65 : RIAttName(pk_rel, riinfo->pk_attnums[i]));
2081 : 65 : quoteOneName(fkattname + 3,
2082 : 65 : RIAttName(fk_rel, riinfo->fk_attnums[i]));
2083 : 65 : ri_GenerateQual(&querybuf, sep,
2084 : : pkattname, pk_type,
2085 : 65 : riinfo->pf_eq_oprs[i],
2086 : : fkattname, fk_type);
2087 [ - + ]: 65 : if (pk_coll != fk_coll)
2703 alvherre@alvh.no-ip. 2088 :UBC 0 : ri_GenerateQualCollation(&querybuf, pk_coll);
2703 alvherre@alvh.no-ip. 2089 :CBC 65 : sep = "AND";
2090 : : }
2091 : :
2092 : : /*
2093 : : * Start the WHERE clause with the partition constraint (except if this is
2094 : : * the default partition and there's no other partition, because the
2095 : : * partition constraint is the empty string in that case.)
2096 : : */
2097 : 65 : constraintDef = pg_get_partconstrdef_string(RelationGetRelid(pk_rel), "pk");
2098 [ + - + - ]: 65 : if (constraintDef && constraintDef[0] != '\0')
2099 : 65 : appendStringInfo(&querybuf, ") WHERE %s AND (",
2100 : : constraintDef);
2101 : : else
2142 drowley@postgresql.o 2102 :UBC 0 : appendStringInfoString(&querybuf, ") WHERE (");
2103 : :
2703 alvherre@alvh.no-ip. 2104 :CBC 65 : sep = "";
2105 [ + + ]: 130 : for (i = 0; i < riinfo->nkeys; i++)
2106 : : {
2107 : 65 : quoteOneName(fkattname, RIAttName(fk_rel, riinfo->fk_attnums[i]));
2108 : 65 : appendStringInfo(&querybuf,
2109 : : "%sfk.%s IS NOT NULL",
2110 : : sep, fkattname);
2111 [ + - - ]: 65 : switch (riinfo->confmatchtype)
2112 : : {
2113 : 65 : case FKCONSTR_MATCH_SIMPLE:
2114 : 65 : sep = " AND ";
2115 : 65 : break;
2703 alvherre@alvh.no-ip. 2116 :UBC 0 : case FKCONSTR_MATCH_FULL:
2117 : 0 : sep = " OR ";
2118 : 0 : break;
2119 : : }
2120 : : }
2703 alvherre@alvh.no-ip. 2121 :CBC 65 : appendStringInfoChar(&querybuf, ')');
2122 : :
2123 : : /*
2124 : : * Temporarily increase work_mem so that the check query can be executed
2125 : : * more efficiently. It seems okay to do this because the query is simple
2126 : : * enough to not use a multiple of work_mem, and one typically would not
2127 : : * have many large foreign-key validations happening concurrently. So
2128 : : * this seems to meet the criteria for being considered a "maintenance"
2129 : : * operation, and accordingly we use maintenance_work_mem. However, we
2130 : : * must also set hash_mem_multiplier to 1, since it is surely not okay to
2131 : : * let that get applied to the maintenance_work_mem value.
2132 : : *
2133 : : * We use the equivalent of a function SET option to allow the setting to
2134 : : * persist for exactly the duration of the check query. guc.c also takes
2135 : : * care of undoing the setting on error.
2136 : : */
2137 : 65 : save_nestlevel = NewGUCNestLevel();
2138 : :
2139 : 65 : snprintf(workmembuf, sizeof(workmembuf), "%d", maintenance_work_mem);
2140 : 65 : (void) set_config_option("work_mem", workmembuf,
2141 : : PGC_USERSET, PGC_S_SESSION,
2142 : : GUC_ACTION_SAVE, true, 0, false);
2220 pg@bowt.ie 2143 : 65 : (void) set_config_option("hash_mem_multiplier", "1",
2144 : : PGC_USERSET, PGC_S_SESSION,
2145 : : GUC_ACTION_SAVE, true, 0, false);
2146 : :
717 tgl@sss.pgh.pa.us 2147 : 65 : SPI_connect();
2148 : :
2149 : : /*
2150 : : * Generate the plan. We don't need to cache it, and there are no
2151 : : * arguments to the plan.
2152 : : */
2703 alvherre@alvh.no-ip. 2153 : 65 : qplan = SPI_prepare(querybuf.data, 0, NULL);
2154 : :
2155 [ - + ]: 65 : if (qplan == NULL)
2703 alvherre@alvh.no-ip. 2156 [ # # ]:UBC 0 : elog(ERROR, "SPI_prepare returned %s for %s",
2157 : : SPI_result_code_string(SPI_result), querybuf.data);
2158 : :
2159 : : /*
2160 : : * Run the plan. For safety we force a current snapshot to be used. (In
2161 : : * transaction-snapshot mode, this arguably violates transaction isolation
2162 : : * rules, but we really haven't got much choice.) We don't need to
2163 : : * register the snapshot, because SPI_execute_snapshot will see to it. We
2164 : : * need at most one tuple returned, so pass limit = 1.
2165 : : */
2703 alvherre@alvh.no-ip. 2166 :CBC 65 : spi_result = SPI_execute_snapshot(qplan,
2167 : : NULL, NULL,
2168 : : GetLatestSnapshot(),
2169 : : InvalidSnapshot,
2170 : : true, false, 1);
2171 : :
2172 : : /* Check result */
2173 [ - + ]: 65 : if (spi_result != SPI_OK_SELECT)
2703 alvherre@alvh.no-ip. 2174 [ # # ]:UBC 0 : elog(ERROR, "SPI_execute_snapshot returned %s", SPI_result_code_string(spi_result));
2175 : :
2176 : : /* Did we find a tuple that would violate the constraint? */
2703 alvherre@alvh.no-ip. 2177 [ + + ]:CBC 65 : if (SPI_processed > 0)
2178 : : {
2179 : : TupleTableSlot *slot;
2180 : 22 : HeapTuple tuple = SPI_tuptable->vals[0];
2181 : 22 : TupleDesc tupdesc = SPI_tuptable->tupdesc;
2182 : : RI_ConstraintInfo fake_riinfo;
2183 : :
2184 : 22 : slot = MakeSingleTupleTableSlot(tupdesc, &TTSOpsVirtual);
2185 : :
2186 : 22 : heap_deform_tuple(tuple, tupdesc,
2187 : : slot->tts_values, slot->tts_isnull);
2188 : 22 : ExecStoreVirtualTuple(slot);
2189 : :
2190 : : /*
2191 : : * The columns to look at in the result tuple are 1..N, not whatever
2192 : : * they are in the fk_rel. Hack up riinfo so that ri_ReportViolation
2193 : : * will behave properly.
2194 : : *
2195 : : * In addition to this, we have to pass the correct tupdesc to
2196 : : * ri_ReportViolation, overriding its normal habit of using the pk_rel
2197 : : * or fk_rel's tupdesc.
2198 : : */
2199 : 22 : memcpy(&fake_riinfo, riinfo, sizeof(RI_ConstraintInfo));
2200 [ + + ]: 44 : for (i = 0; i < fake_riinfo.nkeys; i++)
2201 : 22 : fake_riinfo.pk_attnums[i] = i + 1;
2202 : :
2203 : 22 : ri_ReportViolation(&fake_riinfo, pk_rel, fk_rel,
2204 : : slot, tupdesc, 0, false, true);
2205 : : }
2206 : :
2207 [ - + ]: 43 : if (SPI_finish() != SPI_OK_FINISH)
2703 alvherre@alvh.no-ip. 2208 [ # # ]:UBC 0 : elog(ERROR, "SPI_finish failed");
2209 : :
2210 : : /*
2211 : : * Restore work_mem and hash_mem_multiplier.
2212 : : */
2703 alvherre@alvh.no-ip. 2213 :CBC 43 : AtEOXact_GUC(true, save_nestlevel);
2214 : 43 : }
2215 : :
2216 : :
2217 : : /* ----------
2218 : : * Local functions below
2219 : : * ----------
2220 : : */
2221 : :
2222 : :
2223 : : /*
2224 : : * quoteOneName --- safely quote a single SQL name
2225 : : *
2226 : : * buffer must be MAX_QUOTED_NAME_LEN long (includes room for \0)
2227 : : */
2228 : : static void
8914 tgl@sss.pgh.pa.us 2229 : 13023 : quoteOneName(char *buffer, const char *name)
2230 : : {
2231 : : /* Rather than trying to be smart, just always quote it. */
2232 : 13023 : *buffer++ = '"';
2233 [ + + ]: 79964 : while (*name)
2234 : : {
2235 [ - + ]: 66941 : if (*name == '"')
8914 tgl@sss.pgh.pa.us 2236 :UBC 0 : *buffer++ = '"';
8914 tgl@sss.pgh.pa.us 2237 :CBC 66941 : *buffer++ = *name++;
2238 : : }
2239 : 13023 : *buffer++ = '"';
2240 : 13023 : *buffer = '\0';
2241 : 13023 : }
2242 : :
2243 : : /*
2244 : : * quoteRelationName --- safely quote a fully qualified relation name
2245 : : *
2246 : : * buffer must be MAX_QUOTED_REL_NAME_LEN long (includes room for \0)
2247 : : */
2248 : : static void
2249 : 2885 : quoteRelationName(char *buffer, Relation rel)
2250 : : {
8913 2251 : 2885 : quoteOneName(buffer, get_namespace_name(RelationGetNamespace(rel)));
8914 2252 : 2885 : buffer += strlen(buffer);
2253 : 2885 : *buffer++ = '.';
2254 : 2885 : quoteOneName(buffer, RelationGetRelationName(rel));
2255 : 2885 : }
2256 : :
2257 : : /*
2258 : : * ri_GenerateQual --- generate a WHERE clause equating two variables
2259 : : *
2260 : : * This basically appends " sep leftop op rightop" to buf, adding casts
2261 : : * and schema qualification as needed to ensure that the parser will select
2262 : : * the operator we specify. leftop and rightop should be parenthesized
2263 : : * if they aren't variables or parameters.
2264 : : */
2265 : : static void
7134 2266 : 3090 : ri_GenerateQual(StringInfo buf,
2267 : : const char *sep,
2268 : : const char *leftop, Oid leftoptype,
2269 : : Oid opoid,
2270 : : const char *rightop, Oid rightoptype)
2271 : : {
3083 2272 : 3090 : appendStringInfo(buf, " %s ", sep);
2273 : 3090 : generate_operator_clause(buf, leftop, leftoptype, opoid,
2274 : : rightop, rightoptype);
6776 2275 : 3090 : }
2276 : :
2277 : : /*
2278 : : * ri_GenerateQualCollation --- add a COLLATE spec to a WHERE clause
2279 : : *
2280 : : * We only have to use this function when directly comparing the referencing
2281 : : * and referenced columns, if they are of different collations; else the
2282 : : * parser will fail to resolve the collation to use. We don't need to use
2283 : : * this function for RI queries that compare a variable to a $n parameter.
2284 : : * Since parameter symbols always have default collation, the effect will be
2285 : : * to use the variable's collation.
2286 : : *
2287 : : * Note that we require that the collations of the referencing and the
2288 : : * referenced column have the same notion of equality: Either they have to
2289 : : * both be deterministic or else they both have to be the same. (See also
2290 : : * ATAddForeignKeyConstraint().)
2291 : : */
2292 : : static void
5617 2293 : 8 : ri_GenerateQualCollation(StringInfo buf, Oid collation)
2294 : : {
2295 : : HeapTuple tp;
2296 : : Form_pg_collation colltup;
2297 : : char *collname;
2298 : : char onename[MAX_QUOTED_NAME_LEN];
2299 : :
2300 : : /* Nothing to do if it's a noncollatable data type */
2301 [ - + ]: 8 : if (!OidIsValid(collation))
5617 tgl@sss.pgh.pa.us 2302 :UBC 0 : return;
2303 : :
5617 tgl@sss.pgh.pa.us 2304 :CBC 8 : tp = SearchSysCache1(COLLOID, ObjectIdGetDatum(collation));
2305 [ - + ]: 8 : if (!HeapTupleIsValid(tp))
5617 tgl@sss.pgh.pa.us 2306 [ # # ]:UBC 0 : elog(ERROR, "cache lookup failed for collation %u", collation);
5617 tgl@sss.pgh.pa.us 2307 :CBC 8 : colltup = (Form_pg_collation) GETSTRUCT(tp);
2308 : 8 : collname = NameStr(colltup->collname);
2309 : :
2310 : : /*
2311 : : * We qualify the name always, for simplicity and to ensure the query is
2312 : : * not search-path-dependent.
2313 : : */
2314 : 8 : quoteOneName(onename, get_namespace_name(colltup->collnamespace));
2315 : 8 : appendStringInfo(buf, " COLLATE %s", onename);
2316 : 8 : quoteOneName(onename, collname);
2317 : 8 : appendStringInfo(buf, ".%s", onename);
2318 : :
2319 : 8 : ReleaseSysCache(tp);
2320 : : }
2321 : :
2322 : : /* ----------
2323 : : * ri_BuildQueryKey -
2324 : : *
2325 : : * Construct a hashtable key for a prepared SPI plan of an FK constraint.
2326 : : *
2327 : : * key: output argument, *key is filled in based on the other arguments
2328 : : * riinfo: info derived from pg_constraint entry
2329 : : * constr_queryno: an internal number identifying the query type
2330 : : * (see RI_PLAN_XXX constants at head of file)
2331 : : * ----------
2332 : : */
2333 : : static void
5183 2334 : 2449 : ri_BuildQueryKey(RI_QueryKey *key, const RI_ConstraintInfo *riinfo,
2335 : : int32 constr_queryno)
2336 : : {
2337 : : /*
2338 : : * Inherited constraints with a common ancestor can share ri_query_cache
2339 : : * entries for all query types except RI_PLAN_CHECK_LOOKUPPK_FROM_PK.
2340 : : * Except in that case, the query processes the other table involved in
2341 : : * the FK constraint (i.e., not the table on which the trigger has been
2342 : : * fired), and so it will be the same for all members of the inheritance
2343 : : * tree. So we may use the root constraint's OID in the hash key, rather
2344 : : * than the constraint's own OID. This avoids creating duplicate SPI
2345 : : * plans, saving lots of work and memory when there are many partitions
2346 : : * with similar FK constraints.
2347 : : *
2348 : : * (Note that we must still have a separate RI_ConstraintInfo for each
2349 : : * constraint, because partitions can have different column orders,
2350 : : * resulting in different pk_attnums[] or fk_attnums[] array contents.)
2351 : : *
2352 : : * We assume struct RI_QueryKey contains no padding bytes, else we'd need
2353 : : * to use memset to clear them.
2354 : : */
1603 alvherre@alvh.no-ip. 2355 [ + + ]: 2449 : if (constr_queryno != RI_PLAN_CHECK_LOOKUPPK_FROM_PK)
2356 : 1919 : key->constr_id = riinfo->constraint_root_id;
2357 : : else
2358 : 530 : key->constr_id = riinfo->constraint_id;
9633 bruce@momjian.us 2359 : 2449 : key->constr_queryno = constr_queryno;
9820 JanWieck@Yahoo.com 2360 : 2449 : }
2361 : :
2362 : : /*
2363 : : * Check that RI trigger function was called in expected context
2364 : : */
2365 : : static void
8566 tgl@sss.pgh.pa.us 2366 : 608181 : ri_CheckTrigger(FunctionCallInfo fcinfo, const char *funcname, int tgkind)
2367 : : {
2368 : 608181 : TriggerData *trigdata = (TriggerData *) fcinfo->context;
2369 : :
2370 [ + - - + ]: 608181 : if (!CALLED_AS_TRIGGER(fcinfo))
8437 tgl@sss.pgh.pa.us 2371 [ # # ]:UBC 0 : ereport(ERROR,
2372 : : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2373 : : errmsg("function \"%s\" was not called by trigger manager", funcname)));
2374 : :
2375 : : /*
2376 : : * Check proper event
2377 : : */
8566 tgl@sss.pgh.pa.us 2378 [ + - ]:CBC 608181 : if (!TRIGGER_FIRED_AFTER(trigdata->tg_event) ||
2379 [ - + ]: 608181 : !TRIGGER_FIRED_FOR_ROW(trigdata->tg_event))
8437 tgl@sss.pgh.pa.us 2380 [ # # ]:UBC 0 : ereport(ERROR,
2381 : : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2382 : : errmsg("function \"%s\" must be fired AFTER ROW", funcname)));
2383 : :
8566 tgl@sss.pgh.pa.us 2384 [ + + + - ]:CBC 608181 : switch (tgkind)
2385 : : {
2386 : 606766 : case RI_TRIGTYPE_INSERT:
2387 [ - + ]: 606766 : if (!TRIGGER_FIRED_BY_INSERT(trigdata->tg_event))
8437 tgl@sss.pgh.pa.us 2388 [ # # ]:UBC 0 : ereport(ERROR,
2389 : : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2390 : : errmsg("function \"%s\" must be fired for INSERT", funcname)));
8566 tgl@sss.pgh.pa.us 2391 :CBC 606766 : break;
2392 : 875 : case RI_TRIGTYPE_UPDATE:
2393 [ - + ]: 875 : if (!TRIGGER_FIRED_BY_UPDATE(trigdata->tg_event))
8437 tgl@sss.pgh.pa.us 2394 [ # # ]:UBC 0 : ereport(ERROR,
2395 : : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2396 : : errmsg("function \"%s\" must be fired for UPDATE", funcname)));
8566 tgl@sss.pgh.pa.us 2397 :CBC 875 : break;
2398 : 540 : case RI_TRIGTYPE_DELETE:
2399 [ - + ]: 540 : if (!TRIGGER_FIRED_BY_DELETE(trigdata->tg_event))
8437 tgl@sss.pgh.pa.us 2400 [ # # ]:UBC 0 : ereport(ERROR,
2401 : : (errcode(ERRCODE_E_R_I_E_TRIGGER_PROTOCOL_VIOLATED),
2402 : : errmsg("function \"%s\" must be fired for DELETE", funcname)));
8566 tgl@sss.pgh.pa.us 2403 :CBC 540 : break;
2404 : : }
7134 2405 : 608181 : }
2406 : :
2407 : :
2408 : : /*
2409 : : * Fetch the RI_ConstraintInfo struct for the trigger's FK constraint.
2410 : : */
2411 : : static RI_ConstraintInfo *
5181 2412 : 611309 : ri_FetchConstraintInfo(Trigger *trigger, Relation trig_rel, bool rel_is_pk)
2413 : : {
7134 2414 : 611309 : Oid constraintOid = trigger->tgconstraint;
2415 : : RI_ConstraintInfo *riinfo;
2416 : :
2417 : : /*
2418 : : * Check that the FK constraint's OID is available; it might not be if
2419 : : * we've been invoked via an ordinary trigger or an old-style "constraint
2420 : : * trigger".
2421 : : */
2422 [ - + ]: 611309 : if (!OidIsValid(constraintOid))
8437 tgl@sss.pgh.pa.us 2423 [ # # ]:UBC 0 : ereport(ERROR,
2424 : : (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
2425 : : errmsg("no pg_constraint entry for trigger \"%s\" on table \"%s\"",
2426 : : trigger->tgname, RelationGetRelationName(trig_rel)),
2427 : : errhint("Remove this referential integrity trigger and its mates, then do ALTER TABLE ADD CONSTRAINT.")));
2428 : :
2429 : : /* Find or create a hashtable entry for the constraint */
5181 tgl@sss.pgh.pa.us 2430 :CBC 611309 : riinfo = ri_LoadConstraintInfo(constraintOid);
2431 : :
2432 : : /* Do some easy cross-checks against the trigger call data */
7134 2433 [ + + ]: 611309 : if (rel_is_pk)
2434 : : {
5181 2435 [ + - ]: 2747 : if (riinfo->fk_relid != trigger->tgconstrrelid ||
2436 [ - + ]: 2747 : riinfo->pk_relid != RelationGetRelid(trig_rel))
7134 tgl@sss.pgh.pa.us 2437 [ # # ]:UBC 0 : elog(ERROR, "wrong pg_constraint entry for trigger \"%s\" on table \"%s\"",
2438 : : trigger->tgname, RelationGetRelationName(trig_rel));
2439 : : }
2440 : : else
2441 : : {
2717 alvherre@alvh.no-ip. 2442 [ + - ]:CBC 608562 : if (riinfo->fk_relid != RelationGetRelid(trig_rel) ||
2443 [ - + ]: 608562 : riinfo->pk_relid != trigger->tgconstrrelid)
2717 alvherre@alvh.no-ip. 2444 [ # # ]:UBC 0 : elog(ERROR, "wrong pg_constraint entry for trigger \"%s\" on table \"%s\"",
2445 : : trigger->tgname, RelationGetRelationName(trig_rel));
2446 : : }
2447 : :
2737 peter@eisentraut.org 2448 [ + + ]:CBC 611309 : if (riinfo->confmatchtype != FKCONSTR_MATCH_FULL &&
2449 [ + - ]: 610996 : riinfo->confmatchtype != FKCONSTR_MATCH_PARTIAL &&
2450 [ - + ]: 610996 : riinfo->confmatchtype != FKCONSTR_MATCH_SIMPLE)
2737 peter@eisentraut.org 2451 [ # # ]:UBC 0 : elog(ERROR, "unrecognized confmatchtype: %d",
2452 : : riinfo->confmatchtype);
2453 : :
2737 peter@eisentraut.org 2454 [ - + ]:CBC 611309 : if (riinfo->confmatchtype == FKCONSTR_MATCH_PARTIAL)
2737 peter@eisentraut.org 2455 [ # # ]:UBC 0 : ereport(ERROR,
2456 : : (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
2457 : : errmsg("MATCH PARTIAL not yet implemented")));
2458 : :
5181 tgl@sss.pgh.pa.us 2459 :CBC 611309 : return riinfo;
2460 : : }
2461 : :
2462 : : /*
2463 : : * Fetch or create the RI_ConstraintInfo struct for an FK constraint.
2464 : : */
2465 : : static RI_ConstraintInfo *
2466 : 616506 : ri_LoadConstraintInfo(Oid constraintOid)
2467 : : {
2468 : : RI_ConstraintInfo *riinfo;
2469 : : bool found;
2470 : : HeapTuple tup;
2471 : : Form_pg_constraint conForm;
2472 : :
2473 : : /*
2474 : : * On the first call initialize the hashtable
2475 : : */
2476 [ + + ]: 616506 : if (!ri_constraint_cache)
2477 : 262 : ri_InitHashTables();
2478 : :
2479 : : /*
2480 : : * Find or create a hash entry. If we find a valid one, just return it.
2481 : : */
2482 : 616506 : riinfo = (RI_ConstraintInfo *) hash_search(ri_constraint_cache,
2483 : : &constraintOid,
2484 : : HASH_ENTER, &found);
2485 [ + + ]: 616506 : if (!found)
2486 : 2544 : riinfo->valid = false;
2487 [ + + ]: 613962 : else if (riinfo->valid)
2488 : 613692 : return riinfo;
2489 : :
2490 : : /*
2491 : : * Fetch the pg_constraint row so we can fill in the entry.
2492 : : */
2493 : 2814 : tup = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constraintOid));
2494 [ - + ]: 2814 : if (!HeapTupleIsValid(tup)) /* should not happen */
5181 tgl@sss.pgh.pa.us 2495 [ # # ]:UBC 0 : elog(ERROR, "cache lookup failed for constraint %u", constraintOid);
5181 tgl@sss.pgh.pa.us 2496 :CBC 2814 : conForm = (Form_pg_constraint) GETSTRUCT(tup);
2497 : :
4838 bruce@momjian.us 2498 [ - + ]: 2814 : if (conForm->contype != CONSTRAINT_FOREIGN) /* should not happen */
5181 tgl@sss.pgh.pa.us 2499 [ # # ]:UBC 0 : elog(ERROR, "constraint %u is not a foreign key constraint",
2500 : : constraintOid);
2501 : :
2502 : : /* And extract data */
5181 tgl@sss.pgh.pa.us 2503 [ - + ]:CBC 2814 : Assert(riinfo->constraint_id == constraintOid);
1996 2504 [ + + ]: 2814 : if (OidIsValid(conForm->conparentid))
2505 : 960 : riinfo->constraint_root_id =
2506 : 960 : get_ri_constraint_root(conForm->conparentid);
2507 : : else
2508 : 1854 : riinfo->constraint_root_id = constraintOid;
5181 2509 : 2814 : riinfo->oidHashValue = GetSysCacheHashValue1(CONSTROID,
2510 : : ObjectIdGetDatum(constraintOid));
1996 2511 : 2814 : riinfo->rootHashValue = GetSysCacheHashValue1(CONSTROID,
2512 : : ObjectIdGetDatum(riinfo->constraint_root_id));
7134 2513 : 2814 : memcpy(&riinfo->conname, &conForm->conname, sizeof(NameData));
2514 : 2814 : riinfo->pk_relid = conForm->confrelid;
2515 : 2814 : riinfo->fk_relid = conForm->conrelid;
2516 : 2814 : riinfo->confupdtype = conForm->confupdtype;
2517 : 2814 : riinfo->confdeltype = conForm->confdeltype;
2518 : 2814 : riinfo->confmatchtype = conForm->confmatchtype;
709 peter@eisentraut.org 2519 : 2814 : riinfo->hasperiod = conForm->conperiod;
2520 : :
2778 alvherre@alvh.no-ip. 2521 : 2814 : DeconstructFkConstraintRow(tup,
2522 : : &riinfo->nkeys,
2523 : 2814 : riinfo->fk_attnums,
2524 : 2814 : riinfo->pk_attnums,
2525 : 2814 : riinfo->pf_eq_oprs,
2526 : 2814 : riinfo->pp_eq_oprs,
1723 peter@eisentraut.org 2527 : 2814 : riinfo->ff_eq_oprs,
2528 : : &riinfo->ndelsetcols,
2529 : 2814 : riinfo->confdelsetcols);
2530 : :
2531 : : /*
2532 : : * For temporal FKs, get the operators and functions we need. We ask the
2533 : : * opclass of the PK element for these. This all gets cached (as does the
2534 : : * generated plan), so there's no performance issue.
2535 : : */
709 2536 [ + + ]: 2814 : if (riinfo->hasperiod)
2537 : : {
2538 : 141 : Oid opclass = get_index_column_opclass(conForm->conindid, riinfo->nkeys);
2539 : :
2540 : 141 : FindFKPeriodOpers(opclass,
2541 : : &riinfo->period_contained_by_oper,
2542 : : &riinfo->agged_period_contained_by_oper,
2543 : : &riinfo->period_intersect_oper);
2544 : : }
2545 : :
2546 : : /* Metadata used by fast path. */
149 amitlan@postgresql.o 2547 : 2814 : riinfo->conindid = conForm->conindid;
2548 : 2814 : riinfo->pk_is_partitioned =
2549 : 2814 : (get_rel_relkind(riinfo->pk_relid) == RELKIND_PARTITIONED_TABLE);
20 2550 : 2814 : riinfo->pk_index_is_btree =
2551 : 2814 : (get_rel_relam(riinfo->conindid) == BTREE_AM_OID);
2552 : :
7134 tgl@sss.pgh.pa.us 2553 : 2814 : ReleaseSysCache(tup);
2554 : :
2555 : : /*
2556 : : * For efficient processing of invalidation messages below, we keep a
2557 : : * doubly-linked count list of all currently valid entries.
2558 : : */
1394 drowley@postgresql.o 2559 : 2814 : dclist_push_tail(&ri_constraint_cache_valid_list, &riinfo->valid_link);
2560 : :
5181 tgl@sss.pgh.pa.us 2561 : 2814 : riinfo->valid = true;
2562 : :
149 amitlan@postgresql.o 2563 : 2814 : riinfo->fpmeta = NULL;
2564 : :
5181 tgl@sss.pgh.pa.us 2565 : 2814 : return riinfo;
2566 : : }
2567 : :
2568 : : /*
2569 : : * get_ri_constraint_root
2570 : : * Returns the OID of the constraint's root parent
2571 : : */
2572 : : static Oid
1996 2573 : 960 : get_ri_constraint_root(Oid constrOid)
2574 : : {
2575 : : for (;;)
2576 : 232 : {
2577 : : HeapTuple tuple;
2578 : : Oid constrParentOid;
2579 : :
2580 : 1192 : tuple = SearchSysCache1(CONSTROID, ObjectIdGetDatum(constrOid));
2581 [ - + ]: 1192 : if (!HeapTupleIsValid(tuple))
1996 tgl@sss.pgh.pa.us 2582 [ # # ]:UBC 0 : elog(ERROR, "cache lookup failed for constraint %u", constrOid);
1996 tgl@sss.pgh.pa.us 2583 :CBC 1192 : constrParentOid = ((Form_pg_constraint) GETSTRUCT(tuple))->conparentid;
2584 : 1192 : ReleaseSysCache(tuple);
2585 [ + + ]: 1192 : if (!OidIsValid(constrParentOid))
2586 : 960 : break; /* we reached the root constraint */
2587 : 232 : constrOid = constrParentOid;
2588 : : }
2589 : 960 : return constrOid;
2590 : : }
2591 : :
2592 : : /*
2593 : : * Callback for pg_constraint inval events
2594 : : *
2595 : : * While most syscache callbacks just flush all their entries, pg_constraint
2596 : : * gets enough update traffic that it's probably worth being smarter.
2597 : : * Invalidate any ri_constraint_cache entry associated with the syscache
2598 : : * entry with the specified hash value, or all entries if hashvalue == 0.
2599 : : *
2600 : : * Note: at the time a cache invalidation message is processed there may be
2601 : : * active references to the cache. Because of this we never remove entries
2602 : : * from the cache, but only mark them invalid, which is harmless to active
2603 : : * uses. (Any query using an entry should hold a lock sufficient to keep that
2604 : : * data from changing under it --- but we may get cache flushes anyway.)
2605 : : *
2606 : : * The fast-path metadata hanging off an entry is subject to the same rule.
2607 : : * We unlink it so that the next check rebuilds it, but the object itself is
2608 : : * only queued here and is actually released by AtEOXact_RI().
2609 : : */
2610 : : static void
190 michael@paquier.xyz 2611 : 55892 : InvalidateConstraintCacheCallBack(Datum arg, SysCacheIdentifier cacheid,
2612 : : uint32 hashvalue)
2613 : : {
2614 : : dlist_mutable_iter iter;
2615 : :
5181 tgl@sss.pgh.pa.us 2616 [ - + ]: 55892 : Assert(ri_constraint_cache != NULL);
2617 : :
2618 : : /*
2619 : : * If the list of currently valid entries gets excessively large, we mark
2620 : : * them all invalid so we can empty the list. This arrangement avoids
2621 : : * O(N^2) behavior in situations where a session touches many foreign keys
2622 : : * and also does many ALTER TABLEs, such as a restore from pg_dump.
2623 : : */
1394 drowley@postgresql.o 2624 [ - + ]: 55892 : if (dclist_count(&ri_constraint_cache_valid_list) > 1000)
3989 tgl@sss.pgh.pa.us 2625 :UBC 0 : hashvalue = 0; /* pretend it's a cache reset */
2626 : :
1394 drowley@postgresql.o 2627 [ + + + + ]:CBC 255409 : dclist_foreach_modify(iter, &ri_constraint_cache_valid_list)
2628 : : {
2629 : 199517 : RI_ConstraintInfo *riinfo = dclist_container(RI_ConstraintInfo,
2630 : : valid_link, iter.cur);
2631 : :
2632 : : /*
2633 : : * We must invalidate not only entries directly matching the given
2634 : : * hash value, but also child entries, in case the invalidation
2635 : : * affects a root constraint.
2636 : : */
1996 tgl@sss.pgh.pa.us 2637 [ + + ]: 199517 : if (hashvalue == 0 ||
2638 [ + + ]: 199474 : riinfo->oidHashValue == hashvalue ||
2639 [ + + ]: 197682 : riinfo->rootHashValue == hashvalue)
2640 : : {
3989 2641 : 2051 : riinfo->valid = false;
2642 : :
2643 : : /*
2644 : : * Detach any fast-path metadata so that the next check
2645 : : * repopulates it, but do not free it here. ri_FastPathCheck()
2646 : : * and the flush routines copy riinfo->fpmeta into a local (and
2647 : : * take FmgrInfo pointers into it) and then run index scans, tuple
2648 : : * locking, and user-supplied cast and equality functions, all of
2649 : : * which can accept invalidation messages and reach this callback.
2650 : : * Freeing now would leave those callers reading freed memory.
2651 : : * Queue it instead; AtEOXact_RI() releases it once no RI check
2652 : : * can be running.
2653 : : */
148 amitlan@postgresql.o 2654 [ + + ]: 2051 : if (riinfo->fpmeta)
2655 : : {
8 2656 : 713 : riinfo->fpmeta->next_dead = ri_fpmeta_dead_list;
2657 : 713 : ri_fpmeta_dead_list = riinfo->fpmeta;
148 2658 : 713 : riinfo->fpmeta = NULL;
2659 : : }
2660 : :
2661 : : /* Remove invalidated entries from the list, too */
1394 drowley@postgresql.o 2662 : 2051 : dclist_delete_from(&ri_constraint_cache_valid_list, iter.cur);
2663 : : }
2664 : : }
8566 tgl@sss.pgh.pa.us 2665 : 55892 : }
2666 : :
2667 : :
2668 : : /*
2669 : : * Prepare execution plan for a query to enforce an RI restriction
2670 : : */
2671 : : static SPIPlanPtr
58 peter@eisentraut.org 2672 :GNC 1159 : ri_PlanCheck(const char *querystr, int nargs, const Oid *argtypes,
2673 : : RI_QueryKey *qkey, Relation fk_rel, Relation pk_rel)
2674 : : {
2675 : : SPIPlanPtr qplan;
2676 : : Relation query_rel;
2677 : : Oid save_userid;
2678 : : int save_sec_context;
2679 : :
2680 : : /*
2681 : : * Use the query type code to determine whether the query is run against
2682 : : * the PK or FK table; we'll do the check as that table's owner
2683 : : */
1603 alvherre@alvh.no-ip. 2684 [ + + ]:CBC 1159 : if (qkey->constr_queryno <= RI_PLAN_LAST_ON_PK)
2685 : 608 : query_rel = pk_rel;
2686 : : else
2687 : 551 : query_rel = fk_rel;
2688 : :
2689 : : /* Switch to proper UID to perform check as */
6105 tgl@sss.pgh.pa.us 2690 : 1159 : GetUserIdAndSecContext(&save_userid, &save_sec_context);
2691 : 1159 : SetUserIdAndSecContext(RelationGetForm(query_rel)->relowner,
2692 : : save_sec_context | SECURITY_LOCAL_USERID_CHANGE |
2693 : : SECURITY_NOFORCE_RLS);
2694 : :
2695 : : /* Create the plan */
8524 2696 : 1159 : qplan = SPI_prepare(querystr, nargs, argtypes);
2697 : :
8361 2698 [ - + ]: 1159 : if (qplan == NULL)
3284 peter_e@gmx.net 2699 [ # # ]:UBC 0 : elog(ERROR, "SPI_prepare returned %s for %s", SPI_result_code_string(SPI_result), querystr);
2700 : :
2701 : : /* Restore UID and security context */
6105 tgl@sss.pgh.pa.us 2702 :CBC 1159 : SetUserIdAndSecContext(save_userid, save_sec_context);
2703 : :
2704 : : /* Save the plan */
2486 peter@eisentraut.org 2705 : 1159 : SPI_keepplan(qplan);
2706 : 1159 : ri_HashPreparedPlan(qkey, qplan);
2707 : :
8524 tgl@sss.pgh.pa.us 2708 : 1159 : return qplan;
2709 : : }
2710 : :
2711 : : /*
2712 : : * Perform a query to enforce an RI restriction
2713 : : */
2714 : : static bool
5183 2715 : 2449 : ri_PerformCheck(const RI_ConstraintInfo *riinfo,
2716 : : RI_QueryKey *qkey, SPIPlanPtr qplan,
2717 : : Relation fk_rel, Relation pk_rel,
2718 : : TupleTableSlot *oldslot, TupleTableSlot *newslot,
2719 : : bool is_restrict,
2720 : : bool detectNewRows, int expect_OK)
2721 : : {
2722 : : Relation query_rel,
2723 : : source_rel;
2724 : : bool source_is_pk;
2725 : : Snapshot test_snapshot;
2726 : : Snapshot crosscheck_snapshot;
2727 : : int limit;
2728 : : int spi_result;
2729 : : Oid save_userid;
2730 : : int save_sec_context;
2731 : : Datum vals[RI_MAX_NUMKEYS * 2];
2732 : : char nulls[RI_MAX_NUMKEYS * 2];
2733 : :
2734 : : /*
2735 : : * Use the query type code to determine whether the query is run against
2736 : : * the PK or FK table; we'll do the check as that table's owner
2737 : : */
1603 alvherre@alvh.no-ip. 2738 [ + + ]: 2449 : if (qkey->constr_queryno <= RI_PLAN_LAST_ON_PK)
2739 : 1280 : query_rel = pk_rel;
2740 : : else
2741 : 1169 : query_rel = fk_rel;
2742 : :
2743 : : /*
2744 : : * The values for the query are taken from the table on which the trigger
2745 : : * is called - it is normally the other one with respect to query_rel. An
2746 : : * exception is ri_Check_Pk_Match(), which uses the PK table for both (and
2747 : : * sets queryno to RI_PLAN_CHECK_LOOKUPPK_FROM_PK). We might eventually
2748 : : * need some less klugy way to determine this.
2749 : : */
2750 [ + + ]: 2449 : if (qkey->constr_queryno == RI_PLAN_CHECK_LOOKUPPK)
2751 : : {
2752 : 750 : source_rel = fk_rel;
2753 : 750 : source_is_pk = false;
2754 : : }
2755 : : else
2756 : : {
2757 : 1699 : source_rel = pk_rel;
2758 : 1699 : source_is_pk = true;
2759 : : }
2760 : :
2761 : : /* Extract the parameters to be passed into the query */
2737 peter@eisentraut.org 2762 [ + + ]: 2449 : if (newslot)
2763 : : {
1603 alvherre@alvh.no-ip. 2764 : 894 : ri_ExtractValues(source_rel, newslot, riinfo, source_is_pk,
2765 : : vals, nulls);
2737 peter@eisentraut.org 2766 [ + + ]: 894 : if (oldslot)
1603 alvherre@alvh.no-ip. 2767 : 144 : ri_ExtractValues(source_rel, oldslot, riinfo, source_is_pk,
5183 tgl@sss.pgh.pa.us 2768 : 144 : vals + riinfo->nkeys, nulls + riinfo->nkeys);
2769 : : }
2770 : : else
2771 : : {
1603 alvherre@alvh.no-ip. 2772 : 1555 : ri_ExtractValues(source_rel, oldslot, riinfo, source_is_pk,
2773 : : vals, nulls);
2774 : : }
2775 : :
2776 : : /*
2777 : : * In READ COMMITTED mode, we just need to use an up-to-date regular
2778 : : * snapshot, and we will see all rows that could be interesting. But in
2779 : : * transaction-snapshot mode, we can't change the transaction snapshot. If
2780 : : * the caller passes detectNewRows == false then it's okay to do the query
2781 : : * with the transaction snapshot; otherwise we use a current snapshot, and
2782 : : * tell the executor to error out if it finds any rows under the current
2783 : : * snapshot that wouldn't be visible per the transaction snapshot. Note
2784 : : * that SPI_execute_snapshot will register the snapshots, so we don't need
2785 : : * to bother here.
2786 : : */
5829 mail@joeconway.com 2787 [ + + + + ]: 2449 : if (IsolationUsesXactSnapshot() && detectNewRows)
2788 : : {
3354 tgl@sss.pgh.pa.us 2789 : 36 : CommandCounterIncrement(); /* be sure all my own work is visible */
6681 alvherre@alvh.no-ip. 2790 : 36 : test_snapshot = GetLatestSnapshot();
2791 : 36 : crosscheck_snapshot = GetTransactionSnapshot();
2792 : : }
2793 : : else
2794 : : {
2795 : : /* the default SPI behavior is okay */
8018 tgl@sss.pgh.pa.us 2796 : 2413 : test_snapshot = InvalidSnapshot;
2797 : 2413 : crosscheck_snapshot = InvalidSnapshot;
2798 : : }
2799 : :
2800 : : /*
2801 : : * If this is a select query (e.g., for a 'no action' or 'restrict'
2802 : : * trigger), we only need to see if there is a single row in the table,
2803 : : * matching the key. Otherwise, limit = 0 - because we want the query to
2804 : : * affect ALL the matching rows.
2805 : : */
8566 2806 : 2449 : limit = (expect_OK == SPI_OK_SELECT) ? 1 : 0;
2807 : :
2808 : : /* Switch to proper UID to perform check as */
6105 2809 : 2449 : GetUserIdAndSecContext(&save_userid, &save_sec_context);
2810 : 2449 : SetUserIdAndSecContext(RelationGetForm(query_rel)->relowner,
2811 : : save_sec_context | SECURITY_LOCAL_USERID_CHANGE |
2812 : : SECURITY_NOFORCE_RLS);
2813 : :
2814 : : /*
2815 : : * Finally we can run the query.
2816 : : *
2817 : : * Set fire_triggers to false to ensure that AFTER triggers are queued in
2818 : : * the outer query's after-trigger context and fire after all RI updates
2819 : : * on the same row are complete, rather than immediately.
2820 : : */
8018 2821 : 2449 : spi_result = SPI_execute_snapshot(qplan,
2822 : : vals, nulls,
2823 : : test_snapshot, crosscheck_snapshot,
2824 : : false, false, limit);
2825 : :
2826 : : /* Restore UID and security context */
6105 2827 : 2439 : SetUserIdAndSecContext(save_userid, save_sec_context);
2828 : :
2829 : : /* Check result */
8566 2830 [ - + ]: 2439 : if (spi_result < 0)
3284 peter_e@gmx.net 2831 [ # # ]:UBC 0 : elog(ERROR, "SPI_execute_snapshot returned %s", SPI_result_code_string(spi_result));
2832 : :
8566 tgl@sss.pgh.pa.us 2833 [ + - - + ]:CBC 2439 : if (expect_OK >= 0 && spi_result != expect_OK)
3284 peter_e@gmx.net 2834 [ # # ]:UBC 0 : ereport(ERROR,
2835 : : (errcode(ERRCODE_INTERNAL_ERROR),
2836 : : errmsg("referential integrity query on \"%s\" from constraint \"%s\" on \"%s\" gave unexpected result",
2837 : : RelationGetRelationName(pk_rel),
2838 : : NameStr(riinfo->conname),
2839 : : RelationGetRelationName(fk_rel)),
2840 : : errhint("This is most likely due to a rule having rewritten the query.")));
2841 : :
2842 : : /* XXX wouldn't it be clearer to do this part at the caller? */
1603 alvherre@alvh.no-ip. 2843 [ + + + + ]:CBC 2439 : if (qkey->constr_queryno != RI_PLAN_CHECK_LOOKUPPK_FROM_PK &&
2844 : 1496 : expect_OK == SPI_OK_SELECT &&
2845 [ + + ]: 1496 : (SPI_processed == 0) == (qkey->constr_queryno == RI_PLAN_CHECK_LOOKUPPK))
5183 tgl@sss.pgh.pa.us 2846 [ + + ]: 458 : ri_ReportViolation(riinfo,
2847 : : pk_rel, fk_rel,
2848 : : newslot ? newslot : oldslot,
2849 : : NULL,
2850 : : qkey->constr_queryno, is_restrict, false);
2851 : :
8566 2852 : 1981 : return SPI_processed != 0;
2853 : : }
2854 : :
2855 : : /*
2856 : : * ri_FastPathCheck
2857 : : * Perform per row FK existence check via direct index probe,
2858 : : * bypassing SPI.
2859 : : *
2860 : : * If no matching PK row exists, report the violation via ri_ReportViolation(),
2861 : : * otherwise, the function returns normally.
2862 : : */
2863 : : static void
127 amitlan@postgresql.o 2864 : 52 : ri_FastPathCheck(RI_ConstraintInfo *riinfo,
2865 : : Relation fk_rel, TupleTableSlot *newslot)
2866 : : {
2867 : : Relation pk_rel;
2868 : : Relation idx_rel;
2869 : : IndexScanDesc scandesc;
2870 : : TupleTableSlot *slot;
2871 : : Datum pk_vals[INDEX_MAX_KEYS];
2872 : : char pk_nulls[INDEX_MAX_KEYS];
2873 : : ScanKeyData skey[INDEX_MAX_KEYS];
149 2874 : 52 : bool found = false;
2875 : : Oid saved_userid;
2876 : : int saved_sec_context;
2877 : : Snapshot snapshot;
2878 : :
2879 : : /*
2880 : : * Advance the command counter so the snapshot sees the effects of prior
2881 : : * triggers in this statement. Mirrors what the SPI path does in
2882 : : * ri_PerformCheck().
2883 : : */
2884 : 52 : CommandCounterIncrement();
2885 : 52 : snapshot = RegisterSnapshot(GetTransactionSnapshot());
2886 : :
9 2887 : 52 : INJECTION_POINT("ri-before-pk-lock", NULL);
2888 : :
149 2889 : 52 : pk_rel = table_open(riinfo->pk_relid, RowShareLock);
2890 : :
2891 : : /* Re-read the constraint under that lock; see ri_FastPathGetEntry(). */
9 2892 : 52 : riinfo = ri_LoadConstraintInfo(riinfo->constraint_id);
2893 : :
149 2894 : 52 : idx_rel = index_open(riinfo->conindid, AccessShareLock);
2895 : :
2896 : 52 : slot = table_slot_create(pk_rel, NULL);
2897 : :
2898 : 52 : GetUserIdAndSecContext(&saved_userid, &saved_sec_context);
2899 : 52 : SetUserIdAndSecContext(RelationGetForm(pk_rel)->relowner,
2900 : : saved_sec_context |
2901 : : SECURITY_LOCAL_USERID_CHANGE |
2902 : : SECURITY_NOFORCE_RLS);
2903 : 52 : ri_CheckPermissions(pk_rel);
2904 : :
2905 : : /*
2906 : : * Begin the scan under the switched user id, so that any access method
2907 : : * code invoked by index_beginscan() runs as the PK relation's owner. For
2908 : : * btree this has no functional consequence, but it keeps the ordering
2909 : : * correct for out-of-tree access methods.
2910 : : */
20 2911 : 52 : scandesc = index_beginscan(pk_rel, idx_rel,
2912 : : snapshot, NULL,
2913 : : riinfo->nkeys, 0,
2914 : : SO_NONE);
2915 : :
148 2916 [ + + ]: 52 : if (riinfo->fpmeta == NULL)
2917 : : {
2918 : : /* Reload to ensure it's valid. */
2919 : 12 : riinfo = ri_LoadConstraintInfo(riinfo->constraint_id);
127 2920 : 12 : ri_populate_fastpath_metadata(riinfo, fk_rel, idx_rel);
2921 : : }
148 2922 [ - + ]: 52 : Assert(riinfo->fpmeta);
149 2923 : 52 : ri_ExtractValues(fk_rel, newslot, riinfo, false, pk_vals, pk_nulls);
8 2924 : 52 : build_index_scankeys(riinfo, riinfo->fpmeta, idx_rel, pk_vals, pk_nulls,
2925 : : skey);
149 2926 : 52 : found = ri_FastPathProbeOne(pk_rel, idx_rel, scandesc, slot,
2927 : : snapshot, riinfo, skey, riinfo->nkeys);
2928 : 52 : SetUserIdAndSecContext(saved_userid, saved_sec_context);
2929 : 52 : index_endscan(scandesc);
2930 : 52 : ExecDropSingleTupleTableSlot(slot);
2931 : 52 : UnregisterSnapshot(snapshot);
2932 : :
2933 [ + + ]: 52 : if (!found)
2934 : 8 : ri_ReportViolation(riinfo, pk_rel, fk_rel,
2935 : : newslot, NULL,
2936 : : RI_PLAN_CHECK_LOOKUPPK, false, false);
2937 : :
2938 : 44 : index_close(idx_rel, NoLock);
2939 : 44 : table_close(pk_rel, NoLock);
2940 : 44 : }
2941 : :
2942 : : /*
2943 : : * ri_FastPathBatchAdd
2944 : : * Buffer a FK row for batched probing.
2945 : : *
2946 : : * Adds the row to the batch buffer. When the buffer is full, flushes all
2947 : : * buffered rows by probing the PK index. Any violation is reported
2948 : : * immediately during the flush via ri_ReportViolation (which does not return).
2949 : : *
2950 : : * Uses the per-batch cache (RI_FastPathEntry) to avoid per-row relation
2951 : : * open/close, slot creation, etc.
2952 : : *
2953 : : * The batch is also flushed at end of trigger-firing cycle via
2954 : : * ri_FastPathEndBatch().
2955 : : */
2956 : : static void
127 2957 : 606014 : ri_FastPathBatchAdd(RI_ConstraintInfo *riinfo,
2958 : : Relation fk_rel, TupleTableSlot *newslot)
2959 : : {
146 2960 : 606014 : RI_FastPathEntry *fpentry = ri_FastPathGetEntry(riinfo, fk_rel);
2961 : :
2962 : : /*
2963 : : * If this entry is already being flushed, a cast function or an operator
2964 : : * invoked during the flush has re-entered with DML on the same FK. Fall
2965 : : * back to the per-row path rather than touching the batch array, which is
2966 : : * mid-flush.
2967 : : */
76 2968 [ - + ]: 606014 : if (unlikely(fpentry->flushing))
2969 : : {
76 amitlan@postgresql.o 2970 :UBC 0 : ri_FastPathCheck(riinfo, fk_rel, newslot);
2971 : 0 : return;
2972 : : }
2973 : :
2974 : : /*
2975 : : * A batch is filled and flushed within a single trigger-firing cycle, so
2976 : : * every row added to an entry comes from the subtransaction that created
2977 : : * it. AtEOSubXact_RI() relies on this to identify an aborting
2978 : : * subtransaction's entries by the subid stamped at entry creation.
2979 : : */
5 amitlan@postgresql.o 2980 [ - + ]:CBC 606014 : Assert(fpentry->subid == GetCurrentSubTransactionId());
2981 : :
2982 : : /*
2983 : : * Buffer the row. A full batch is flushed below and re-entry is handled
2984 : : * above, so there is always room here; the bounds check just guards the
2985 : : * array write.
2986 : : */
76 2987 [ + - ]: 606014 : if (fpentry->batch_count < RI_FASTPATH_BATCH_SIZE)
2988 : : {
2989 : 606014 : MemoryContext oldcxt = MemoryContextSwitchTo(fpentry->flush_cxt);
2990 : :
2991 : 1212028 : fpentry->batch[fpentry->batch_count] =
2992 : 606014 : ExecCopySlotHeapTuple(newslot);
2993 : 606014 : fpentry->batch_count++;
2994 : 606014 : MemoryContextSwitchTo(oldcxt);
2995 : : }
2996 : : else
76 amitlan@postgresql.o 2997 [ # # ]:UBC 0 : elog(ERROR, "RI fast-path batch unexpectedly full");
2998 : :
2999 : : /* Flush as soon as the batch is full. */
76 amitlan@postgresql.o 3000 [ + + ]:CBC 606014 : if (fpentry->batch_count == RI_FASTPATH_BATCH_SIZE)
146 3001 : 9422 : ri_FastPathBatchFlush(fpentry, fk_rel, riinfo);
3002 : : }
3003 : :
3004 : : /*
3005 : : * ri_FastPathBatchFlush
3006 : : * Flush all buffered FK rows by probing the PK index.
3007 : : *
3008 : : * Dispatches to ri_FastPathFlushArray() for single-column FKs
3009 : : * (using SK_SEARCHARRAY) or ri_FastPathFlushLoop() for multi-column
3010 : : * FKs (per-row probing). Violations are reported immediately via
3011 : : * ri_ReportViolation(), which does not return.
3012 : : */
3013 : : static void
3014 : 11467 : ri_FastPathBatchFlush(RI_FastPathEntry *fpentry, Relation fk_rel,
3015 : : RI_ConstraintInfo *riinfo)
3016 : : {
3017 : 11467 : Relation pk_rel = fpentry->pk_rel;
3018 : 11467 : Relation idx_rel = fpentry->idx_rel;
3019 : 11467 : TupleTableSlot *fk_slot = fpentry->fk_slot;
3020 : : Snapshot snapshot;
3021 : : IndexScanDesc scandesc;
3022 : : Oid saved_userid;
3023 : : int saved_sec_context;
3024 : : MemoryContext oldcxt;
3025 : : FastPathMeta *fpmeta;
3026 : : int violation_index;
3027 : :
3028 [ - + ]: 11467 : if (fpentry->batch_count == 0)
146 amitlan@postgresql.o 3029 :UBC 0 : return;
3030 : :
3031 : : /*
3032 : : * CCI and security context switch are done once for the entire batch.
3033 : : * Per-row CCI is unnecessary because by the time a flush runs, all AFTER
3034 : : * triggers for the buffered rows have already fired (trigger invocations
3035 : : * strictly alternate per row), so a single CCI advances past all their
3036 : : * effects. Per-row security context switch is unnecessary because each
3037 : : * row's probe runs entirely as the PK table owner, same as the SPI path
3038 : : * -- the only difference is that the SPI path sets and restores the
3039 : : * context per row whereas we do it once around the whole batch.
3040 : : */
146 amitlan@postgresql.o 3041 :CBC 11467 : CommandCounterIncrement();
3042 : 11467 : snapshot = RegisterSnapshot(GetTransactionSnapshot());
3043 : :
3044 : : /*
3045 : : * build_index_scankeys() may palloc cast results for cross-type FKs. Use
3046 : : * the entry's short-lived flush context so these don't accumulate across
3047 : : * batches.
3048 : : */
3049 : 11467 : oldcxt = MemoryContextSwitchTo(fpentry->flush_cxt);
3050 : :
3051 : 11467 : GetUserIdAndSecContext(&saved_userid, &saved_sec_context);
3052 : 11467 : SetUserIdAndSecContext(RelationGetForm(pk_rel)->relowner,
3053 : : saved_sec_context |
3054 : : SECURITY_LOCAL_USERID_CHANGE |
3055 : : SECURITY_NOFORCE_RLS);
3056 : :
3057 : : /*
3058 : : * Check that the current user has permission to access pk_rel. Done here
3059 : : * rather than at entry creation so that permission changes between
3060 : : * flushes are respected, matching the per-row behavior of the SPI path,
3061 : : * albeit checked once per flush rather than once per row, like in
3062 : : * ri_FastPathCheck().
3063 : : */
3064 : 11467 : ri_CheckPermissions(pk_rel);
3065 : :
3066 : : /*
3067 : : * Begin the scan under the switched user id, so that any access method
3068 : : * code invoked by index_beginscan() runs as the PK relation's owner. For
3069 : : * btree this has no functional consequence, but it keeps the ordering
3070 : : * correct for out-of-tree access methods.
3071 : : */
20 3072 : 11463 : scandesc = index_beginscan(pk_rel, idx_rel, snapshot, NULL,
3073 : : riinfo->nkeys, 0, SO_NONE);
3074 : :
146 3075 [ + + ]: 11463 : if (riinfo->fpmeta == NULL)
3076 : : {
3077 : : /* Reload to ensure it's valid. */
3078 : 1008 : riinfo = ri_LoadConstraintInfo(riinfo->constraint_id);
127 3079 : 1008 : ri_populate_fastpath_metadata(riinfo, fk_rel, idx_rel);
3080 : : }
146 3081 [ - + ]: 11463 : Assert(riinfo->fpmeta);
3082 : :
3083 : : /*
3084 : : * Take our own reference to the metadata for the duration of the flush.
3085 : : * The probe below runs user-defined cast and equality functions, which
3086 : : * can accept invalidation messages; InvalidateConstraintCacheCallBack()
3087 : : * then clears riinfo->fpmeta, so re-reading it partway through the batch
3088 : : * would find NULL. The object itself stays valid until AtEOXact_RI().
3089 : : */
8 3090 : 11463 : fpmeta = riinfo->fpmeta;
3091 : :
3092 : : /*
3093 : : * The probe runs user-defined cast and equality functions. Set the
3094 : : * flushing flag around it so a re-entrant ri_FastPathBatchAdd on this
3095 : : * entry takes the per-row path, and clear it even on error so the entry
3096 : : * is reusable if the error is caught by a savepoint.
3097 : : */
76 3098 [ - + ]: 11463 : Assert(!fpentry->flushing);
3099 : 11463 : fpentry->flushing = true;
3100 [ + + ]: 11463 : PG_TRY();
3101 : : {
3102 : : /* Skip array overhead for single-row batches. */
3103 [ + + + + ]: 11463 : if (riinfo->nkeys == 1 && fpentry->batch_count > 1)
3104 : 9575 : violation_index = ri_FastPathFlushArray(fpentry, fk_slot, riinfo,
3105 : : fpmeta, fk_rel, snapshot,
3106 : : scandesc);
3107 : : else
3108 : 1888 : violation_index = ri_FastPathFlushLoop(fpentry, fk_slot, riinfo,
3109 : : fpmeta, fk_rel, snapshot,
3110 : : scandesc);
3111 : : }
3112 : 7 : PG_FINALLY();
3113 : : {
3114 : 11463 : fpentry->flushing = false;
3115 : 11463 : fpentry->batch_count = 0;
3116 : : }
3117 [ + + ]: 11463 : PG_END_TRY();
3118 : :
146 3119 : 11456 : SetUserIdAndSecContext(saved_userid, saved_sec_context);
3120 : 11456 : UnregisterSnapshot(snapshot);
3121 : 11456 : index_endscan(scandesc);
3122 : :
3123 [ + + ]: 11456 : if (violation_index >= 0)
3124 : : {
3125 : 315 : ExecStoreHeapTuple(fpentry->batch[violation_index], fk_slot, false);
3126 : 315 : ri_ReportViolation(riinfo, pk_rel, fk_rel,
3127 : : fk_slot, NULL,
3128 : : RI_PLAN_CHECK_LOOKUPPK, false, false);
3129 : : }
3130 : :
3131 : 11141 : MemoryContextReset(fpentry->flush_cxt);
3132 : 11141 : MemoryContextSwitchTo(oldcxt);
3133 : : }
3134 : :
3135 : : /*
3136 : : * ri_FastPathFlushLoop
3137 : : * Multi-column fallback: probe the index once per buffered row.
3138 : : *
3139 : : * Used for composite foreign keys where SK_SEARCHARRAY does not
3140 : : * apply, and also for single-row batches of single-column FKs where
3141 : : * the array overhead is not worth it.
3142 : : *
3143 : : * Returns the index of the first violating row in the batch array, or -1 if
3144 : : * all rows are valid.
3145 : : */
3146 : : static int
3147 : 1888 : ri_FastPathFlushLoop(RI_FastPathEntry *fpentry, TupleTableSlot *fk_slot,
3148 : : const RI_ConstraintInfo *riinfo, FastPathMeta *fpmeta,
3149 : : Relation fk_rel, Snapshot snapshot,
3150 : : IndexScanDesc scandesc)
3151 : : {
3152 : 1888 : Relation pk_rel = fpentry->pk_rel;
3153 : 1888 : Relation idx_rel = fpentry->idx_rel;
3154 : 1888 : TupleTableSlot *pk_slot = fpentry->pk_slot;
3155 : : Datum pk_vals[INDEX_MAX_KEYS];
3156 : : char pk_nulls[INDEX_MAX_KEYS];
3157 : : ScanKeyData skey[INDEX_MAX_KEYS];
3158 : 1888 : bool found = true;
3159 : :
3160 [ + + ]: 3864 : for (int i = 0; i < fpentry->batch_count; i++)
3161 : : {
3162 : 2284 : ExecStoreHeapTuple(fpentry->batch[i], fk_slot, false);
3163 : 2284 : ri_ExtractValues(fk_rel, fk_slot, riinfo, false, pk_vals, pk_nulls);
8 3164 : 2284 : build_index_scankeys(riinfo, fpmeta, idx_rel, pk_vals, pk_nulls, skey);
3165 : :
146 3166 : 2284 : found = ri_FastPathProbeOne(pk_rel, idx_rel, scandesc, pk_slot,
3167 : 2284 : snapshot, riinfo, skey, riinfo->nkeys);
3168 : :
3169 : : /* Report first unmatched row */
3170 [ + + ]: 2277 : if (!found)
3171 : 301 : return i;
3172 : : }
3173 : :
3174 : : /* All pass. */
3175 : 1580 : return -1;
3176 : : }
3177 : :
3178 : : /*
3179 : : * ri_FastPathFlushArray
3180 : : * Single-column fast path using SK_SEARCHARRAY.
3181 : : *
3182 : : * Builds an array of FK values and does one index scan with
3183 : : * SK_SEARCHARRAY. The index AM sorts and deduplicates the array
3184 : : * internally, then walks matching leaf pages in order. Each
3185 : : * matched PK tuple is locked and rechecked as before; a matched[]
3186 : : * bitmap tracks which batch items were satisfied.
3187 : : *
3188 : : * Returns the index of the first violating row in the batch array, or -1 if
3189 : : * all rows are valid.
3190 : : */
3191 : : static int
3192 : 9575 : ri_FastPathFlushArray(RI_FastPathEntry *fpentry, TupleTableSlot *fk_slot,
3193 : : const RI_ConstraintInfo *riinfo, FastPathMeta *fpmeta,
3194 : : Relation fk_rel, Snapshot snapshot,
3195 : : IndexScanDesc scandesc)
3196 : : {
3197 : 9575 : Relation pk_rel = fpentry->pk_rel;
3198 : 9575 : Relation idx_rel = fpentry->idx_rel;
3199 : 9575 : TupleTableSlot *pk_slot = fpentry->pk_slot;
3200 : : Datum search_vals[RI_FASTPATH_BATCH_SIZE];
3201 : : bool matched[RI_FASTPATH_BATCH_SIZE];
3202 : 9575 : int nvals = fpentry->batch_count;
3203 : : Datum pk_vals[INDEX_MAX_KEYS];
3204 : : char pk_nulls[INDEX_MAX_KEYS];
3205 : : ScanKeyData skey[1];
3206 : : FmgrInfo *cast_func_finfo;
3207 : : FmgrInfo *eq_opr_finfo;
3208 : : Oid elem_type;
3209 : : int16 elem_len;
3210 : : bool elem_byval;
3211 : : char elem_align;
3212 : : ArrayType *arr;
3213 : :
3214 [ - + ]: 9575 : Assert(fpmeta);
3215 : :
3216 : 9575 : memset(matched, 0, nvals * sizeof(bool));
3217 : :
3218 : : /*
3219 : : * Extract FK values, casting to the operator's expected input type if
3220 : : * needed (e.g. int8 FK -> int4 for int48eq).
3221 : : */
3222 : 9575 : cast_func_finfo = &fpmeta->cast_func_finfo[0];
3223 : 9575 : eq_opr_finfo = &fpmeta->eq_opr_finfo[0];
3224 [ + + ]: 613282 : for (int i = 0; i < nvals; i++)
3225 : : {
3226 : 603707 : ExecStoreHeapTuple(fpentry->batch[i], fk_slot, false);
3227 : 603707 : ri_ExtractValues(fk_rel, fk_slot, riinfo, false, pk_vals, pk_nulls);
3228 : :
3229 : : /* Cast if needed (e.g. int8 FK -> numeric PK) */
3230 [ + + ]: 603707 : if (OidIsValid(cast_func_finfo->fn_oid))
3231 : 256 : search_vals[i] = FunctionCall3(cast_func_finfo,
3232 : : pk_vals[0],
3233 : : Int32GetDatum(-1),
3234 : : BoolGetDatum(false));
3235 : : else
3236 : 603451 : search_vals[i] = pk_vals[0];
3237 : : }
3238 : :
3239 : : /*
3240 : : * Array element type must match the operator's right-hand input type,
3241 : : * which is what the index comparison expects on the search side.
3242 : : * ri_populate_fastpath_metadata() stores exactly this via
3243 : : * get_op_opfamily_properties(), which returns the operator's right-hand
3244 : : * type as the subtype for cross-type operators (e.g. int8 for int48eq)
3245 : : * and the common type for same-type operators.
3246 : : */
3247 : 9575 : elem_type = fpmeta->subtypes[0];
3248 [ - + ]: 9575 : Assert(OidIsValid(elem_type));
3249 : 9575 : get_typlenbyvalalign(elem_type, &elem_len, &elem_byval, &elem_align);
3250 : :
3251 : 9575 : arr = construct_array(search_vals, nvals,
3252 : : elem_type, elem_len, elem_byval, elem_align);
3253 : :
3254 : : /*
3255 : : * Build scan key with SK_SEARCHARRAY. The index AM code will internally
3256 : : * sort and deduplicate, then walk leaf pages in order.
3257 : : *
3258 : : * ri_fastpath_is_applicable() restricts the fast path to btree indexes,
3259 : : * which support SK_SEARCHARRAY.
3260 : : *
3261 : : * This path handles single-column FKs only, so index_attnos[0] == 1.
3262 : : */
3263 [ - + ]: 9575 : Assert(idx_rel->rd_indam->amsearcharray);
139 3264 [ - + ]: 9575 : Assert(fpmeta->index_attnos[0] == 1);
146 3265 : 9575 : ScanKeyEntryInitialize(&skey[0],
3266 : : SK_SEARCHARRAY,
139 3267 : 9575 : fpmeta->index_attnos[0],
146 3268 : 9575 : fpmeta->strats[0],
3269 : : fpmeta->subtypes[0],
139 3270 : 9575 : idx_rel->rd_indcollation[fpmeta->index_attnos[0] - 1],
3271 : : fpmeta->regops[0],
3272 : : PointerGetDatum(arr));
3273 : :
146 3274 : 9575 : index_rescan(scandesc, skey, 1, NULL, 0);
3275 : :
3276 : : /*
3277 : : * Walk all matches. The index AM returns them in index order. For each
3278 : : * match, find which batch item(s) it satisfies.
3279 : : */
3280 [ + + ]: 421353 : while (index_getnext_slot(scandesc, ForwardScanDirection, pk_slot))
3281 : : {
3282 : : Datum found_val;
3283 : : bool found_null;
3284 : :
3285 : : /*
3286 : : * No key recheck is needed here, so we have no use for
3287 : : * concurrently_updated. Unlike ri_FastPathProbeOne(), which takes
3288 : : * the index scan's word for it that the tuple matches, this path
3289 : : * compares the key against every buffered FK value below, and it does
3290 : : * so using found_val, which is read out of the version we actually
3291 : : * locked. A concurrent key update is therefore caught by that
3292 : : * comparison: the batch item that led us to this tuple is left
3293 : : * unmatched and reported as a violation.
3294 : : */
9 3295 [ - + ]: 411778 : if (!ri_LockPKTuple(pk_rel, pk_slot, snapshot, NULL))
146 3296 : 1 : continue;
3297 : :
3298 : : /*
3299 : : * Extract the PK value from the matched and locked tuple.
3300 : : *
3301 : : * A foreign key may reference a nullable unique column, not just a
3302 : : * NOT NULL primary key. If ri_LockPKTuple() chased an update chain
3303 : : * to a version whose referenced key is now NULL, that version cannot
3304 : : * equal any buffered (non-null) FK value, so skip it. This mirrors
3305 : : * the SPI path, where the requalifying "pkatt = $n" yields NULL and
3306 : : * the row is not returned.
3307 : : */
3308 : 411778 : found_val = slot_getattr(pk_slot, riinfo->pk_attnums[0], &found_null);
20 3309 [ + + ]: 411778 : if (found_null)
3310 : 1 : continue;
3311 : :
3312 : : /*
3313 : : * Linear scan to mark all batch items matching this PK value.
3314 : : * O(batch_size) per match, O(batch_size^2) worst case -- fine for the
3315 : : * current batch size of 64.
3316 : : */
146 3317 [ + + ]: 26736456 : for (int i = 0; i < nvals; i++)
3318 : : {
3319 [ + + + + ]: 39788838 : if (!matched[i] &&
3320 : 13464159 : DatumGetBool(FunctionCall2Coll(eq_opr_finfo,
3321 : 13464159 : idx_rel->rd_indcollation[0],
3322 : : found_val,
3323 : : search_vals[i])))
3324 : 603688 : matched[i] = true;
3325 : : }
3326 : : }
3327 : :
3328 : : /* Report first unmatched row */
3329 [ + + ]: 613130 : for (int i = 0; i < nvals; i++)
3330 [ + + ]: 603569 : if (!matched[i])
3331 : 14 : return i;
3332 : :
3333 : : /* All pass. */
3334 : 9561 : return -1;
3335 : : }
3336 : :
3337 : : /*
3338 : : * ri_FastPathProbeOne
3339 : : * Probe the PK index for one set of scan keys, lock the matching
3340 : : * tuple
3341 : : *
3342 : : * Returns true if a matching PK row was found, locked, and (if
3343 : : * applicable) visible to the transaction snapshot.
3344 : : */
3345 : : static bool
149 3346 : 2336 : ri_FastPathProbeOne(Relation pk_rel, Relation idx_rel,
3347 : : IndexScanDesc scandesc, TupleTableSlot *slot,
3348 : : Snapshot snapshot, const RI_ConstraintInfo *riinfo,
3349 : : ScanKeyData *skey, int nkeys)
3350 : : {
3351 : 2336 : bool found = false;
3352 : :
3353 : 2336 : index_rescan(scandesc, skey, nkeys, NULL, 0);
3354 : :
3355 [ + + ]: 2336 : if (index_getnext_slot(scandesc, ForwardScanDirection, slot))
3356 : : {
3357 : : bool concurrently_updated;
3358 : :
3359 [ + + ]: 2030 : if (ri_LockPKTuple(pk_rel, slot, snapshot,
3360 : : &concurrently_updated))
3361 : : {
3362 [ + + ]: 2022 : if (concurrently_updated)
140 3363 : 3 : found = recheck_matched_pk_tuple(idx_rel, skey, nkeys, slot);
3364 : : else
149 3365 : 2019 : found = true;
3366 : : }
3367 : : }
3368 : :
3369 : 2329 : return found;
3370 : : }
3371 : :
3372 : : /*
3373 : : * ri_LockPKTuple
3374 : : * Lock a PK tuple found by the fast-path index scan.
3375 : : *
3376 : : * Calls table_tuple_lock() directly with handling specific to RI checks.
3377 : : * Returns true if the tuple was successfully locked.
3378 : : *
3379 : : * If concurrently_updated is not NULL, sets *concurrently_updated to true
3380 : : * if the locked tuple was reached by following an update chain
3381 : : * (tmfd.traversed), indicating the caller should recheck the key. Callers
3382 : : * that compare the locked tuple's key against the value they were looking
3383 : : * for anyway can pass NULL.
3384 : : */
3385 : : static bool
3386 : 413808 : ri_LockPKTuple(Relation pk_rel, TupleTableSlot *slot, Snapshot snap,
3387 : : bool *concurrently_updated)
3388 : : {
3389 : : TM_FailureData tmfd;
3390 : : TM_Result result;
3391 : 413808 : int lockflags = TUPLE_LOCK_FLAG_LOCK_UPDATE_IN_PROGRESS;
3392 : :
9 3393 [ + + ]: 413808 : if (concurrently_updated)
3394 : 2030 : *concurrently_updated = false;
3395 : :
149 3396 [ + + ]: 413808 : if (!IsolationUsesXactSnapshot())
3397 : 413786 : lockflags |= TUPLE_LOCK_FLAG_FIND_LAST_VERSION;
3398 : :
3399 : 413808 : result = table_tuple_lock(pk_rel, &slot->tts_tid, snap,
3400 : : slot, GetCurrentCommandId(false),
3401 : : LockTupleKeyShare, LockWaitBlock,
3402 : : lockflags, &tmfd);
3403 : :
3404 [ + + + - : 413805 : switch (result)
- - ]
3405 : : {
3406 : 413800 : case TM_Ok:
9 3407 [ + + + + ]: 413800 : if (tmfd.traversed && concurrently_updated)
149 3408 : 3 : *concurrently_updated = true;
3409 : 413800 : return true;
3410 : :
3411 : 4 : case TM_Deleted:
3412 [ + + ]: 4 : if (IsolationUsesXactSnapshot())
3413 [ + - ]: 3 : ereport(ERROR,
3414 : : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3415 : : errmsg("could not serialize access due to concurrent delete")));
3416 : 1 : return false;
3417 : :
3418 : 1 : case TM_Updated:
3419 [ + - ]: 1 : if (IsolationUsesXactSnapshot())
3420 [ + - ]: 1 : ereport(ERROR,
3421 : : (errcode(ERRCODE_T_R_SERIALIZATION_FAILURE),
3422 : : errmsg("could not serialize access due to concurrent update")));
3423 : :
3424 : : /*
3425 : : * In READ COMMITTED, FIND_LAST_VERSION should have chased the
3426 : : * chain and returned TM_Ok. Getting here means something
3427 : : * unexpected -- fall through to error.
3428 : : */
149 amitlan@postgresql.o 3429 [ # # ]:UBC 0 : elog(ERROR, "unexpected table_tuple_lock status: %u", result);
3430 : : break;
3431 : :
3432 : 0 : case TM_SelfModified:
3433 : :
3434 : : /*
3435 : : * The current command or a later command in this transaction
3436 : : * modified the PK row. This shouldn't normally happen during an
3437 : : * FK check (we're not modifying pk_rel), but handle it safely by
3438 : : * treating the tuple as not found.
3439 : : */
3440 : 0 : return false;
3441 : :
3442 : 0 : case TM_Invisible:
3443 [ # # ]: 0 : elog(ERROR, "attempted to lock invisible tuple");
3444 : : break;
3445 : :
3446 : 0 : default:
3447 [ # # ]: 0 : elog(ERROR, "unrecognized table_tuple_lock status: %u", result);
3448 : : break;
3449 : : }
3450 : :
3451 : : return false; /* keep compiler quiet */
3452 : : }
3453 : :
3454 : : static bool
149 amitlan@postgresql.o 3455 :CBC 606816 : ri_fastpath_is_applicable(const RI_ConstraintInfo *riinfo)
3456 : : {
3457 : : /*
3458 : : * Partitioned referenced tables are skipped for simplicity, since they
3459 : : * require routing the probe through the correct partition using
3460 : : * PartitionDirectory.
3461 : : */
3462 [ + + ]: 606816 : if (riinfo->pk_is_partitioned)
3463 : 599 : return false;
3464 : :
3465 : : /*
3466 : : * Temporal foreign keys use range overlap and containment semantics (&&,
3467 : : * <@, range_agg()) that inherently involve aggregation and multiple-row
3468 : : * reasoning, so they stay on the SPI path.
3469 : : */
3470 [ + + ]: 606217 : if (riinfo->hasperiod)
3471 : 151 : return false;
3472 : :
3473 : : /*
3474 : : * The fast path probes the referenced index directly and, for
3475 : : * single-column keys, uses SK_SEARCHARRAY. A foreign key's referenced
3476 : : * index need not be a primary key; transformFkeyCheckAttrs() accepts any
3477 : : * unique index, so an out-of-tree amcanunique access method could reach
3478 : : * here. Restrict the fast path to btree, which is what the direct probe
3479 : : * and SK_SEARCHARRAY assume; other access methods fall back to SPI.
3480 : : */
20 3481 [ - + ]: 606066 : if (!riinfo->pk_index_is_btree)
20 amitlan@postgresql.o 3482 :UBC 0 : return false;
3483 : :
149 amitlan@postgresql.o 3484 :CBC 606066 : return true;
3485 : : }
3486 : :
3487 : : /*
3488 : : * ri_CheckPermissions
3489 : : * Check that the current user has permissions to look into the schema of
3490 : : * and SELECT from 'query_rel'
3491 : : */
3492 : : static void
3493 : 11519 : ri_CheckPermissions(Relation query_rel)
3494 : : {
3495 : : AclResult aclresult;
3496 : :
3497 : : /* USAGE on schema. */
3498 : 11519 : aclresult = object_aclcheck(NamespaceRelationId,
3499 : 11519 : RelationGetNamespace(query_rel),
3500 : : GetUserId(), ACL_USAGE);
3501 [ - + ]: 11519 : if (aclresult != ACLCHECK_OK)
149 amitlan@postgresql.o 3502 :UBC 0 : aclcheck_error(aclresult, OBJECT_SCHEMA,
3503 : 0 : get_namespace_name(RelationGetNamespace(query_rel)));
3504 : :
3505 : : /* SELECT on relation. */
149 amitlan@postgresql.o 3506 :CBC 11519 : aclresult = pg_class_aclcheck(RelationGetRelid(query_rel), GetUserId(),
3507 : : ACL_SELECT);
3508 [ + + ]: 11519 : if (aclresult != ACLCHECK_OK)
3509 : 4 : aclcheck_error(aclresult, OBJECT_TABLE,
3510 : 4 : RelationGetRelationName(query_rel));
3511 : 11515 : }
3512 : :
3513 : : /*
3514 : : * recheck_matched_pk_tuple
3515 : : * After following an update chain (tmfd.traversed), verify that
3516 : : * the locked PK tuple still matches the original search keys.
3517 : : *
3518 : : * A non-key update (e.g. changing a non-PK column) creates a new tuple version
3519 : : * that we've now locked, but the key is unchanged -- that's fine. A key
3520 : : * update means the value we were looking for is gone, so we should treat it as
3521 : : * not found.
3522 : : */
3523 : : static bool
140 3524 : 3 : recheck_matched_pk_tuple(Relation idxrel, ScanKeyData *skeys, int nkeys,
3525 : : TupleTableSlot *new_slot)
3526 : : {
3527 : : /*
3528 : : * TODO: BuildIndexInfo does a syscache lookup + palloc on every call.
3529 : : * This only fires on the concurrent-update path (tmfd.traversed), which
3530 : : * should be rare, so the cost is acceptable for now. If profiling shows
3531 : : * otherwise, cache the IndexInfo in FastPathMeta.
3532 : : */
149 3533 : 3 : IndexInfo *indexInfo = BuildIndexInfo(idxrel);
3534 : : Datum values[INDEX_MAX_KEYS];
3535 : : bool isnull[INDEX_MAX_KEYS];
3536 : 3 : bool matched = true;
3537 : :
3538 : : /* PK indexes never have these. */
3539 [ + - - + ]: 3 : Assert(indexInfo->ii_Expressions == NIL &&
3540 : : indexInfo->ii_ExclusionOps == NULL);
3541 : :
3542 : : /* Form the index values and isnull flags given the table tuple. */
140 3543 [ - + ]: 3 : Assert(nkeys == indexInfo->ii_NumIndexKeyAttrs);
149 3544 : 3 : FormIndexDatum(indexInfo, new_slot, NULL, values, isnull);
140 3545 [ + + ]: 4 : for (int i = 0; i < nkeys; i++)
3546 : : {
149 3547 : 3 : ScanKeyData *skey = &skeys[i];
3548 : :
3549 : : /*
3550 : : * A foreign key may reference a nullable unique column, so the
3551 : : * version we chased the update chain to may have a NULL in a key
3552 : : * column. A NULL never equals the value we searched for, so treat it
3553 : : * as no match, as the SPI path's requalification would.
3554 : : */
20 3555 [ + + ]: 3 : if (isnull[i] ||
3556 [ + + ]: 2 : !DatumGetBool(FunctionCall2Coll(&skey->sk_func,
3557 : : skey->sk_collation,
3558 : : values[i],
3559 : : skey->sk_argument)))
3560 : : {
149 3561 : 2 : matched = false;
3562 : 2 : break;
3563 : : }
3564 : : }
3565 : :
3566 : 3 : return matched;
3567 : : }
3568 : :
3569 : : /*
3570 : : * build_index_scankeys
3571 : : * Build ScanKeys for a direct index probe of the PK's unique index.
3572 : : *
3573 : : * Uses cached compare entries, operator procedures, and strategy numbers
3574 : : * from ri_populate_fastpath_metadata() rather than looking them up on
3575 : : * each invocation. Casts FK values to the operator's expected input
3576 : : * type if needed.
3577 : : */
3578 : : static void
3579 : 2336 : build_index_scankeys(const RI_ConstraintInfo *riinfo,
3580 : : FastPathMeta *fpmeta,
3581 : : Relation idx_rel, Datum *pk_vals,
3582 : : char *pk_nulls, ScanKey skeys)
3583 : : {
3584 [ - + ]: 2336 : Assert(fpmeta);
3585 : :
3586 : : /*
3587 : : * May need to cast each of the individual values of the foreign key to
3588 : : * the corresponding PK column's type if the equality operator demands it.
3589 : : */
3590 [ + + ]: 5564 : for (int i = 0; i < riinfo->nkeys; i++)
3591 : : {
148 3592 [ + - ]: 3228 : if (pk_nulls[i] != 'n' &&
3593 [ + + ]: 3228 : OidIsValid(fpmeta->cast_func_finfo[i].fn_oid))
3594 : 292 : pk_vals[i] = FunctionCall3(&fpmeta->cast_func_finfo[i],
3595 : : pk_vals[i],
3596 : : Int32GetDatum(-1), /* typmod */
3597 : : BoolGetDatum(false)); /* implicit coercion */
3598 : : }
3599 : :
3600 : : /*
3601 : : * Set up ScanKeys for the index scan. This is essentially how
3602 : : * ExecIndexBuildScanKeys() sets them up. Use the cached index_attnos and
3603 : : * the corresponding collation since FK columns may be in a different
3604 : : * order than PK index columns. Place each scan key at the array position
3605 : : * corresponding to its index column, since btree requires keys to be
3606 : : * ordered by attribute number.
3607 : : */
149 3608 [ + + ]: 5564 : for (int i = 0; i < riinfo->nkeys; i++)
3609 : : {
139 3610 : 3228 : AttrNumber pkattrno = fpmeta->index_attnos[i];
3611 : 3228 : int skey_pos = pkattrno - 1; /* 0-based array position */
3612 : :
3613 : 3228 : ScanKeyEntryInitialize(&skeys[skey_pos], 0, pkattrno,
149 3614 : 3228 : fpmeta->strats[i], fpmeta->subtypes[i],
139 3615 : 3228 : idx_rel->rd_indcollation[skey_pos], fpmeta->regops[i],
149 3616 : 3228 : pk_vals[i]);
3617 : : }
3618 : 2336 : }
3619 : :
3620 : : /*
3621 : : * ri_populate_fastpath_metadata
3622 : : * Cache per-key metadata needed by build_index_scankeys().
3623 : : *
3624 : : * Looks up the compare hash entry, operator procedure OID, and index
3625 : : * strategy/subtype for each key column. Called lazily on first use
3626 : : * and persists for the lifetime of the RI_ConstraintInfo entry.
3627 : : */
3628 : : static void
3629 : 1020 : ri_populate_fastpath_metadata(RI_ConstraintInfo *riinfo,
3630 : : Relation fk_rel, Relation idx_rel)
3631 : : {
3632 : : FastPathMeta *fpmeta;
3633 : 1020 : MemoryContext oldcxt = MemoryContextSwitchTo(TopMemoryContext);
3634 : :
3635 [ + - - + ]: 1020 : Assert(riinfo != NULL && riinfo->valid);
8 3636 [ - + ]: 1020 : Assert(riinfo->fpmeta == NULL);
3637 : :
149 3638 : 1020 : fpmeta = palloc_object(FastPathMeta);
8 3639 : 1020 : fpmeta->next_dead = NULL;
3640 : :
3641 : : /* Scratch context for the cached FmgrInfos' fn_mcxt; see FastPathMeta. */
3642 : 1020 : fpmeta->scratch_cxt = AllocSetContextCreate(TopMemoryContext,
3643 : : "RI fast-path finfo scratch",
3644 : : ALLOCSET_SMALL_SIZES);
149 3645 [ + + ]: 2192 : for (int i = 0; i < riinfo->nkeys; i++)
3646 : : {
3647 : 1172 : Oid eq_opr = riinfo->pf_eq_oprs[i];
3648 : 1172 : Oid typeid = RIAttType(fk_rel, riinfo->fk_attnums[i]);
3649 : : Oid lefttype;
3650 : 1172 : RI_CompareHashEntry *entry = ri_HashCompareOp(eq_opr, typeid);
3651 : : int idx_col;
3652 : :
3653 : : /*
3654 : : * Find the index column position for this constraint key. The FK
3655 : : * constraint may reference columns in a different order than they
3656 : : * appear in the PK index, so we must map pk_attnums[i] to the
3657 : : * corresponding index column position.
3658 : : */
139 3659 [ + - ]: 1348 : for (idx_col = 0; idx_col < riinfo->nkeys; idx_col++)
3660 : : {
3661 [ + + ]: 1348 : if (idx_rel->rd_index->indkey.values[idx_col] == riinfo->pk_attnums[i])
3662 : 1172 : break;
3663 : : }
3664 [ - + ]: 1172 : Assert(idx_col < riinfo->nkeys);
3665 : :
3666 : : /* 1-based attribute number */
3667 : 1172 : fpmeta->index_attnos[i] = idx_col + 1;
3668 : :
148 3669 : 1172 : fmgr_info_copy(&fpmeta->cast_func_finfo[i], &entry->cast_func_finfo,
3670 : : fpmeta->scratch_cxt);
3671 : 1172 : fmgr_info_copy(&fpmeta->eq_opr_finfo[i], &entry->eq_opr_finfo,
3672 : : fpmeta->scratch_cxt);
149 3673 : 1172 : fpmeta->regops[i] = get_opcode(eq_opr);
3674 : :
3675 : 1172 : get_op_opfamily_properties(eq_opr,
139 3676 : 1172 : idx_rel->rd_opfamily[idx_col],
3677 : : false,
3678 : : &fpmeta->strats[i],
3679 : : &lefttype,
3680 : : &fpmeta->subtypes[i]);
3681 : : }
3682 : :
149 3683 : 1020 : riinfo->fpmeta = fpmeta;
3684 : 1020 : MemoryContextSwitchTo(oldcxt);
3685 : 1020 : }
3686 : :
3687 : : /*
3688 : : * Extract fields from a tuple into Datum/nulls arrays
3689 : : */
3690 : : static void
2739 andres@anarazel.de 3691 : 608636 : ri_ExtractValues(Relation rel, TupleTableSlot *slot,
3692 : : const RI_ConstraintInfo *riinfo, bool rel_is_pk,
3693 : : Datum *vals, char *nulls)
3694 : : {
3695 : : const int16 *attnums;
3696 : : bool isnull;
3697 : :
5183 tgl@sss.pgh.pa.us 3698 [ + + ]: 608636 : if (rel_is_pk)
3699 : 1843 : attnums = riinfo->pk_attnums;
3700 : : else
3701 : 606793 : attnums = riinfo->fk_attnums;
3702 : :
2737 peter@eisentraut.org 3703 [ + + ]: 1219297 : for (int i = 0; i < riinfo->nkeys; i++)
3704 : : {
2739 andres@anarazel.de 3705 : 610661 : vals[i] = slot_getattr(slot, attnums[i], &isnull);
8566 tgl@sss.pgh.pa.us 3706 [ - + ]: 610661 : nulls[i] = isnull ? 'n' : ' ';
3707 : : }
3708 : 608636 : }
3709 : :
3710 : : /*
3711 : : * Produce an error report
3712 : : *
3713 : : * If the failed constraint was on insert/update to the FK table,
3714 : : * we want the key names and values extracted from there, and the error
3715 : : * message to look like 'key blah is not present in PK'.
3716 : : * Otherwise, the attr names and values come from the PK table and the
3717 : : * message looks like 'key blah is still referenced from FK'.
3718 : : */
3719 : : static void
5183 3720 : 846 : ri_ReportViolation(const RI_ConstraintInfo *riinfo,
3721 : : Relation pk_rel, Relation fk_rel,
3722 : : TupleTableSlot *violatorslot, TupleDesc tupdesc,
3723 : : int queryno, bool is_restrict, bool partgone)
3724 : : {
3725 : : StringInfoData key_names;
3726 : : StringInfoData key_values;
3727 : : bool onfk;
3728 : : const int16 *attnums;
3729 : : Oid rel_oid;
3730 : : AclResult aclresult;
4245 sfrost@snowman.net 3731 : 846 : bool has_perm = true;
3732 : :
3733 : : /*
3734 : : * Determine which relation to complain about. If tupdesc wasn't passed
3735 : : * by caller, assume the violator tuple came from there.
3736 : : */
1603 alvherre@alvh.no-ip. 3737 : 846 : onfk = (queryno == RI_PLAN_CHECK_LOOKUPPK);
3738 [ + + ]: 846 : if (onfk)
3739 : : {
5183 tgl@sss.pgh.pa.us 3740 : 494 : attnums = riinfo->fk_attnums;
4245 sfrost@snowman.net 3741 : 494 : rel_oid = fk_rel->rd_id;
8361 tgl@sss.pgh.pa.us 3742 [ + + ]: 494 : if (tupdesc == NULL)
3743 : 451 : tupdesc = fk_rel->rd_att;
3744 : : }
3745 : : else
3746 : : {
5183 3747 : 352 : attnums = riinfo->pk_attnums;
4245 sfrost@snowman.net 3748 : 352 : rel_oid = pk_rel->rd_id;
8361 tgl@sss.pgh.pa.us 3749 [ + + ]: 352 : if (tupdesc == NULL)
3750 : 330 : tupdesc = pk_rel->rd_att;
3751 : : }
3752 : :
3753 : : /*
3754 : : * Check permissions- if the user does not have access to view the data in
3755 : : * any of the key columns then we don't include the errdetail() below.
3756 : : *
3757 : : * Check if RLS is enabled on the relation first. If so, we don't return
3758 : : * any specifics to avoid leaking data.
3759 : : *
3760 : : * Check table-level permissions next and, failing that, column-level
3761 : : * privileges.
3762 : : *
3763 : : * When a partition at the referenced side is being detached/dropped, we
3764 : : * needn't check, since the user must be the table owner anyway.
3765 : : */
2703 alvherre@alvh.no-ip. 3766 [ + + ]: 846 : if (partgone)
3767 : 22 : has_perm = true;
3768 [ + + ]: 824 : else if (check_enable_rls(rel_oid, InvalidOid, true) != RLS_ENABLED)
3769 : : {
4245 sfrost@snowman.net 3770 : 820 : aclresult = pg_class_aclcheck(rel_oid, GetUserId(), ACL_SELECT);
3771 [ + + ]: 820 : if (aclresult != ACLCHECK_OK)
3772 : : {
3773 : : /* Try for column-level permissions */
2737 peter@eisentraut.org 3774 [ + - ]: 4 : for (int idx = 0; idx < riinfo->nkeys; idx++)
3775 : : {
4245 sfrost@snowman.net 3776 : 4 : aclresult = pg_attribute_aclcheck(rel_oid, attnums[idx],
3777 : : GetUserId(),
3778 : : ACL_SELECT);
3779 : :
3780 : : /* No access to the key */
3781 [ + - ]: 4 : if (aclresult != ACLCHECK_OK)
3782 : : {
3783 : 4 : has_perm = false;
3784 : 4 : break;
3785 : : }
3786 : : }
3787 : : }
3788 : : }
3789 : : else
4048 mail@joeconway.com 3790 : 4 : has_perm = false;
3791 : :
4245 sfrost@snowman.net 3792 [ + + ]: 846 : if (has_perm)
3793 : : {
3794 : : /* Get printable versions of the keys involved */
3795 : 838 : initStringInfo(&key_names);
3796 : 838 : initStringInfo(&key_values);
2737 peter@eisentraut.org 3797 [ + + ]: 2063 : for (int idx = 0; idx < riinfo->nkeys; idx++)
3798 : : {
4245 sfrost@snowman.net 3799 : 1225 : int fnum = attnums[idx];
2739 andres@anarazel.de 3800 : 1225 : Form_pg_attribute att = TupleDescAttr(tupdesc, fnum - 1);
3801 : : char *name,
3802 : : *val;
3803 : : Datum datum;
3804 : : bool isnull;
3805 : :
3806 : 1225 : name = NameStr(att->attname);
3807 : :
3808 : 1225 : datum = slot_getattr(violatorslot, fnum, &isnull);
3809 [ + - ]: 1225 : if (!isnull)
3810 : : {
3811 : : Oid foutoid;
3812 : : bool typisvarlena;
3813 : :
3814 : 1225 : getTypeOutputInfo(att->atttypid, &foutoid, &typisvarlena);
3815 : 1225 : val = OidOutputFunctionCall(foutoid, datum);
3816 : : }
3817 : : else
4245 sfrost@snowman.net 3818 :UBC 0 : val = "null";
3819 : :
4245 sfrost@snowman.net 3820 [ + + ]:CBC 1225 : if (idx > 0)
3821 : : {
3822 : 387 : appendStringInfoString(&key_names, ", ");
3823 : 387 : appendStringInfoString(&key_values, ", ");
3824 : : }
3825 : 1225 : appendStringInfoString(&key_names, name);
3826 : 1225 : appendStringInfoString(&key_values, val);
3827 : : }
3828 : : }
3829 : :
2703 alvherre@alvh.no-ip. 3830 [ + + ]: 846 : if (partgone)
3831 [ + - ]: 22 : ereport(ERROR,
3832 : : (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
3833 : : errmsg("removing partition \"%s\" violates foreign key constraint \"%s\"",
3834 : : RelationGetRelationName(pk_rel),
3835 : : NameStr(riinfo->conname)),
3836 : : errdetail("Key (%s)=(%s) is still referenced from table \"%s\".",
3837 : : key_names.data, key_values.data,
3838 : : RelationGetRelationName(fk_rel)),
3839 : : errtableconstraint(fk_rel, NameStr(riinfo->conname))));
1603 3840 [ + + ]: 824 : else if (onfk)
8424 bruce@momjian.us 3841 [ + - + + ]: 494 : ereport(ERROR,
3842 : : (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
3843 : : errmsg("insert or update on table \"%s\" violates foreign key constraint \"%s\"",
3844 : : RelationGetRelationName(fk_rel),
3845 : : NameStr(riinfo->conname)),
3846 : : has_perm ?
3847 : : errdetail("Key (%s)=(%s) is not present in table \"%s\".",
3848 : : key_names.data, key_values.data,
3849 : : RelationGetRelationName(pk_rel)) :
3850 : : errdetail("Key is not present in table \"%s\".",
3851 : : RelationGetRelationName(pk_rel)),
3852 : : errtableconstraint(fk_rel, NameStr(riinfo->conname))));
633 peter@eisentraut.org 3853 [ + + ]: 330 : else if (is_restrict)
3854 [ + - + - ]: 20 : ereport(ERROR,
3855 : : (errcode(ERRCODE_RESTRICT_VIOLATION),
3856 : : errmsg("update or delete on table \"%s\" violates RESTRICT setting of foreign key constraint \"%s\" on table \"%s\"",
3857 : : RelationGetRelationName(pk_rel),
3858 : : NameStr(riinfo->conname),
3859 : : RelationGetRelationName(fk_rel)),
3860 : : has_perm ?
3861 : : errdetail("Key (%s)=(%s) is referenced from table \"%s\".",
3862 : : key_names.data, key_values.data,
3863 : : RelationGetRelationName(fk_rel)) :
3864 : : errdetail("Key is referenced from table \"%s\".",
3865 : : RelationGetRelationName(fk_rel)),
3866 : : errtableconstraint(fk_rel, NameStr(riinfo->conname))));
3867 : : else
8424 bruce@momjian.us 3868 [ + - + + ]: 310 : ereport(ERROR,
3869 : : (errcode(ERRCODE_FOREIGN_KEY_VIOLATION),
3870 : : errmsg("update or delete on table \"%s\" violates foreign key constraint \"%s\" on table \"%s\"",
3871 : : RelationGetRelationName(pk_rel),
3872 : : NameStr(riinfo->conname),
3873 : : RelationGetRelationName(fk_rel)),
3874 : : has_perm ?
3875 : : errdetail("Key (%s)=(%s) is still referenced from table \"%s\".",
3876 : : key_names.data, key_values.data,
3877 : : RelationGetRelationName(fk_rel)) :
3878 : : errdetail("Key is still referenced from table \"%s\".",
3879 : : RelationGetRelationName(fk_rel)),
3880 : : errtableconstraint(fk_rel, NameStr(riinfo->conname))));
3881 : : }
3882 : :
3883 : :
3884 : : /*
3885 : : * ri_NullCheck -
3886 : : *
3887 : : * Determine the NULL state of all key values in a tuple
3888 : : *
3889 : : * Returns one of RI_KEYS_ALL_NULL, RI_KEYS_NONE_NULL or RI_KEYS_SOME_NULL.
3890 : : */
3891 : : static int
3074 andrew@dunslane.net 3892 : 609782 : ri_NullCheck(TupleDesc tupDesc,
3893 : : TupleTableSlot *slot,
3894 : : const RI_ConstraintInfo *riinfo, bool rel_is_pk)
3895 : : {
3896 : : const int16 *attnums;
9633 bruce@momjian.us 3897 : 609782 : bool allnull = true;
3898 : 609782 : bool nonenull = true;
3899 : :
5183 tgl@sss.pgh.pa.us 3900 [ + + ]: 609782 : if (rel_is_pk)
3901 : 2070 : attnums = riinfo->pk_attnums;
3902 : : else
3903 : 607712 : attnums = riinfo->fk_attnums;
3904 : :
2737 peter@eisentraut.org 3905 [ + + ]: 1221901 : for (int i = 0; i < riinfo->nkeys; i++)
3906 : : {
2739 andres@anarazel.de 3907 [ + + ]: 612119 : if (slot_attisnull(slot, attnums[i]))
9820 JanWieck@Yahoo.com 3908 : 370 : nonenull = false;
3909 : : else
3910 : 611749 : allnull = false;
3911 : : }
3912 : :
3913 [ + + ]: 609782 : if (allnull)
3914 : 186 : return RI_KEYS_ALL_NULL;
3915 : :
3916 [ + + ]: 609596 : if (nonenull)
3917 : 609460 : return RI_KEYS_NONE_NULL;
3918 : :
3919 : 136 : return RI_KEYS_SOME_NULL;
3920 : : }
3921 : :
3922 : :
3923 : : /*
3924 : : * ri_InitHashTables -
3925 : : *
3926 : : * Initialize our internal hash tables.
3927 : : */
3928 : : static void
3999 tgl@sss.pgh.pa.us 3929 : 262 : ri_InitHashTables(void)
3930 : : {
3931 : : HASHCTL ctl;
3932 : :
5181 3933 : 262 : ctl.keysize = sizeof(Oid);
3934 : 262 : ctl.entrysize = sizeof(RI_ConstraintInfo);
3935 : 262 : ri_constraint_cache = hash_create("RI constraint cache",
3936 : : RI_INIT_CONSTRAINTHASHSIZE,
3937 : : &ctl, HASH_ELEM | HASH_BLOBS);
3938 : :
3939 : : /* Arrange to flush cache on pg_constraint changes */
3940 : 262 : CacheRegisterSyscacheCallback(CONSTROID,
3941 : : InvalidateConstraintCacheCallBack,
3942 : : (Datum) 0);
3943 : :
9633 bruce@momjian.us 3944 : 262 : ctl.keysize = sizeof(RI_QueryKey);
9096 tgl@sss.pgh.pa.us 3945 : 262 : ctl.entrysize = sizeof(RI_QueryHashEntry);
5181 3946 : 262 : ri_query_cache = hash_create("RI query cache",
3947 : : RI_INIT_QUERYHASHSIZE,
3948 : : &ctl, HASH_ELEM | HASH_BLOBS);
3949 : :
7134 3950 : 262 : ctl.keysize = sizeof(RI_CompareKey);
3951 : 262 : ctl.entrysize = sizeof(RI_CompareHashEntry);
5181 3952 : 262 : ri_compare_cache = hash_create("RI compare cache",
3953 : : RI_INIT_QUERYHASHSIZE,
3954 : : &ctl, HASH_ELEM | HASH_BLOBS);
9820 JanWieck@Yahoo.com 3955 : 262 : }
3956 : :
3957 : :
3958 : : /*
3959 : : * ri_FetchPreparedPlan -
3960 : : *
3961 : : * Lookup for a query key in our private hash table of prepared
3962 : : * and saved SPI execution plans. Return the plan if found or NULL.
3963 : : */
3964 : : static SPIPlanPtr
3965 : 2449 : ri_FetchPreparedPlan(RI_QueryKey *key)
3966 : : {
3967 : : RI_QueryHashEntry *entry;
3968 : : SPIPlanPtr plan;
3969 : :
3970 : : /*
3971 : : * On the first call initialize the hashtable
3972 : : */
3973 [ - + ]: 2449 : if (!ri_query_cache)
9820 JanWieck@Yahoo.com 3974 :UBC 0 : ri_InitHashTables();
3975 : :
3976 : : /*
3977 : : * Lookup for the key
3978 : : */
9633 bruce@momjian.us 3979 :CBC 2449 : entry = (RI_QueryHashEntry *) hash_search(ri_query_cache,
3980 : : key,
3981 : : HASH_FIND, NULL);
9820 JanWieck@Yahoo.com 3982 [ + + ]: 2449 : if (entry == NULL)
3983 : 1026 : return NULL;
3984 : :
3985 : : /*
3986 : : * Check whether the plan is still valid. If it isn't, we don't want to
3987 : : * simply rely on plancache.c to regenerate it; rather we should start
3988 : : * from scratch and rebuild the query text too. This is to cover cases
3989 : : * such as table/column renames. We depend on the plancache machinery to
3990 : : * detect possible invalidations, though.
3991 : : *
3992 : : * CAUTION: this check is only trustworthy if the caller has already
3993 : : * locked both FK and PK rels.
3994 : : */
6555 tgl@sss.pgh.pa.us 3995 : 1423 : plan = entry->plan;
3996 [ + - + + ]: 1423 : if (plan && SPI_plan_is_valid(plan))
3997 : 1290 : return plan;
3998 : :
3999 : : /*
4000 : : * Otherwise we might as well flush the cached plan now, to free a little
4001 : : * memory space before we make a new one.
4002 : : */
4003 : 133 : entry->plan = NULL;
4004 [ + - ]: 133 : if (plan)
4005 : 133 : SPI_freeplan(plan);
4006 : :
4007 : 133 : return NULL;
4008 : : }
4009 : :
4010 : :
4011 : : /*
4012 : : * ri_HashPreparedPlan -
4013 : : *
4014 : : * Add another plan to our private SPI query plan hashtable.
4015 : : */
4016 : : static void
7105 4017 : 1159 : ri_HashPreparedPlan(RI_QueryKey *key, SPIPlanPtr plan)
4018 : : {
4019 : : RI_QueryHashEntry *entry;
4020 : : bool found;
4021 : :
4022 : : /*
4023 : : * On the first call initialize the hashtable
4024 : : */
9820 JanWieck@Yahoo.com 4025 [ - + ]: 1159 : if (!ri_query_cache)
9820 JanWieck@Yahoo.com 4026 :UBC 0 : ri_InitHashTables();
4027 : :
4028 : : /*
4029 : : * Add the new plan. We might be overwriting an entry previously found
4030 : : * invalid by ri_FetchPreparedPlan.
4031 : : */
9633 bruce@momjian.us 4032 :CBC 1159 : entry = (RI_QueryHashEntry *) hash_search(ri_query_cache,
4033 : : key,
4034 : : HASH_ENTER, &found);
6555 tgl@sss.pgh.pa.us 4035 [ + + - + ]: 1159 : Assert(!found || entry->plan == NULL);
9820 JanWieck@Yahoo.com 4036 : 1159 : entry->plan = plan;
4037 : 1159 : }
4038 : :
4039 : :
4040 : : /*
4041 : : * ri_KeysEqual -
4042 : : *
4043 : : * Check if all key values in OLD and NEW are "equivalent":
4044 : : * For normal FKs we check for equality.
4045 : : * For temporal FKs we check that the PK side is a superset of its old value,
4046 : : * or the FK side is a subset of its old value.
4047 : : *
4048 : : * Note: at some point we might wish to redefine this as checking for
4049 : : * "IS NOT DISTINCT" rather than "=", that is, allow two nulls to be
4050 : : * considered equal. Currently there is no need since all callers have
4051 : : * previously found at least one of the rows to contain no nulls.
4052 : : */
4053 : : static bool
2739 andres@anarazel.de 4054 : 1432 : ri_KeysEqual(Relation rel, TupleTableSlot *oldslot, TupleTableSlot *newslot,
4055 : : const RI_ConstraintInfo *riinfo, bool rel_is_pk)
4056 : : {
4057 : : const int16 *attnums;
4058 : :
7134 tgl@sss.pgh.pa.us 4059 [ + + ]: 1432 : if (rel_is_pk)
4060 : 943 : attnums = riinfo->pk_attnums;
4061 : : else
4062 : 489 : attnums = riinfo->fk_attnums;
4063 : :
4064 : : /* XXX: could be worthwhile to fetch all necessary attrs at once */
2737 peter@eisentraut.org 4065 [ + + ]: 2202 : for (int i = 0; i < riinfo->nkeys; i++)
4066 : : {
4067 : : Datum oldvalue;
4068 : : Datum newvalue;
4069 : : bool isnull;
4070 : :
4071 : : /*
4072 : : * Get one attribute's oldvalue. If it is NULL - they're not equal.
4073 : : */
2739 andres@anarazel.de 4074 : 1652 : oldvalue = slot_getattr(oldslot, attnums[i], &isnull);
9820 JanWieck@Yahoo.com 4075 [ + + ]: 1652 : if (isnull)
4076 : 882 : return false;
4077 : :
4078 : : /*
4079 : : * Get one attribute's newvalue. If it is NULL - they're not equal.
4080 : : */
2739 andres@anarazel.de 4081 : 1634 : newvalue = slot_getattr(newslot, attnums[i], &isnull);
9820 JanWieck@Yahoo.com 4082 [ + + ]: 1634 : if (isnull)
4083 : 2 : return false;
4084 : :
2719 peter@eisentraut.org 4085 [ + + ]: 1632 : if (rel_is_pk)
4086 : : {
4087 : : /*
4088 : : * If we are looking at the PK table, then do a bytewise
4089 : : * comparison. We must propagate PK changes if the value is
4090 : : * changed to one that "looks" different but would compare as
4091 : : * equal using the equality operator. This only makes a
4092 : : * difference for ON UPDATE CASCADE, but for consistency we treat
4093 : : * all changes to the PK the same.
4094 : : */
615 drowley@postgresql.o 4095 : 1105 : CompactAttribute *att = TupleDescCompactAttr(oldslot->tts_tupleDescriptor, attnums[i] - 1);
4096 : :
2719 peter@eisentraut.org 4097 [ + + ]: 1105 : if (!datum_image_eq(oldvalue, newvalue, att->attbyval, att->attlen))
4098 : 653 : return false;
4099 : : }
4100 : : else
4101 : : {
4102 : : Oid eq_opr;
4103 : :
4104 : : /*
4105 : : * When comparing the PERIOD columns we can skip the check
4106 : : * whenever the referencing column stayed equal or shrank, so test
4107 : : * with the contained-by operator instead.
4108 : : */
709 4109 [ + + + + ]: 527 : if (riinfo->hasperiod && i == riinfo->nkeys - 1)
4110 : 32 : eq_opr = riinfo->period_contained_by_oper;
4111 : : else
4112 : 495 : eq_opr = riinfo->ff_eq_oprs[i];
4113 : :
4114 : : /*
4115 : : * For the FK table, compare with the appropriate equality
4116 : : * operator. Changes that compare equal will still satisfy the
4117 : : * constraint after the update.
4118 : : */
650 4119 [ + + ]: 527 : if (!ri_CompareWithCast(eq_opr, RIAttType(rel, attnums[i]), RIAttCollation(rel, attnums[i]),
4120 : : newvalue, oldvalue))
2719 4121 : 209 : return false;
4122 : : }
4123 : : }
4124 : :
9820 JanWieck@Yahoo.com 4125 : 550 : return true;
4126 : : }
4127 : :
4128 : :
4129 : : /*
4130 : : * ri_CompareWithCast -
4131 : : *
4132 : : * Call the appropriate comparison operator for two values.
4133 : : * Normally this is equality, but for the PERIOD part of foreign keys
4134 : : * it is ContainedBy, so the order of lhs vs rhs is significant.
4135 : : * See below for how the collation is applied.
4136 : : *
4137 : : * NB: we have already checked that neither value is null.
4138 : : */
4139 : : static bool
650 peter@eisentraut.org 4140 : 527 : ri_CompareWithCast(Oid eq_opr, Oid typeid, Oid collid,
4141 : : Datum lhs, Datum rhs)
4142 : : {
7134 tgl@sss.pgh.pa.us 4143 : 527 : RI_CompareHashEntry *entry = ri_HashCompareOp(eq_opr, typeid);
4144 : :
4145 : : /* Do we need to cast the values? */
4146 [ + + ]: 527 : if (OidIsValid(entry->cast_func_finfo.fn_oid))
4147 : : {
709 peter@eisentraut.org 4148 : 8 : lhs = FunctionCall3(&entry->cast_func_finfo,
4149 : : lhs,
4150 : : Int32GetDatum(-1), /* typmod */
4151 : : BoolGetDatum(false)); /* implicit coercion */
4152 : 8 : rhs = FunctionCall3(&entry->cast_func_finfo,
4153 : : rhs,
4154 : : Int32GetDatum(-1), /* typmod */
4155 : : BoolGetDatum(false)); /* implicit coercion */
4156 : : }
4157 : :
4158 : : /*
4159 : : * Apply the comparison operator.
4160 : : *
4161 : : * Note: This function is part of a call stack that determines whether an
4162 : : * update to a row is significant enough that it needs checking or action
4163 : : * on the other side of a foreign-key constraint. Therefore, the
4164 : : * comparison here would need to be done with the collation of the *other*
4165 : : * table. For simplicity (e.g., we might not even have the other table
4166 : : * open), we'll use our own collation. This is fine because we require
4167 : : * that both collations have the same notion of equality (either they are
4168 : : * both deterministic or else they are both the same).
4169 : : *
4170 : : * With range/multirangetypes, the collation of the base type is stored as
4171 : : * part of the rangetype (pg_range.rngcollation), and always used, so
4172 : : * there is no danger of inconsistency even using a non-equals operator.
4173 : : * But if we support arbitrary types with PERIOD, we should perhaps just
4174 : : * always force a re-check.
4175 : : */
650 4176 : 527 : return DatumGetBool(FunctionCall2Coll(&entry->eq_opr_finfo, collid, lhs, rhs));
4177 : : }
4178 : :
4179 : : /*
4180 : : * ri_HashCompareOp -
4181 : : *
4182 : : * Look up or create a cache entry for the given equality operator and
4183 : : * the caller's value type (typeid). The entry holds the operator's
4184 : : * FmgrInfo and, if typeid doesn't match what the operator expects as
4185 : : * its right-hand input, a cast function to coerce the value before
4186 : : * comparison.
4187 : : */
4188 : : static RI_CompareHashEntry *
7134 tgl@sss.pgh.pa.us 4189 : 1699 : ri_HashCompareOp(Oid eq_opr, Oid typeid)
4190 : : {
4191 : : RI_CompareKey key;
4192 : : RI_CompareHashEntry *entry;
4193 : : bool found;
4194 : :
4195 : : /*
4196 : : * On the first call initialize the hashtable
4197 : : */
4198 [ - + ]: 1699 : if (!ri_compare_cache)
7134 tgl@sss.pgh.pa.us 4199 :UBC 0 : ri_InitHashTables();
4200 : :
4201 : : /*
4202 : : * Find or create a hash entry. Note we're assuming RI_CompareKey
4203 : : * contains no struct padding.
4204 : : */
7134 tgl@sss.pgh.pa.us 4205 :CBC 1699 : key.eq_opr = eq_opr;
4206 : 1699 : key.typeid = typeid;
4207 : 1699 : entry = (RI_CompareHashEntry *) hash_search(ri_compare_cache,
4208 : : &key,
4209 : : HASH_ENTER, &found);
4210 [ + + ]: 1699 : if (!found)
4211 : 273 : entry->valid = false;
4212 : :
4213 : : /*
4214 : : * If not already initialized, do so. Since we'll keep this hash entry
4215 : : * for the life of the backend, put any subsidiary info for the function
4216 : : * cache structs into TopMemoryContext.
4217 : : */
4218 [ + + ]: 1699 : if (!entry->valid)
4219 : : {
4220 : : Oid lefttype,
4221 : : righttype,
4222 : : castfunc;
4223 : : CoercionPathType pathtype;
4224 : :
4225 : : /* We always need to know how to call the equality operator */
4226 : 273 : fmgr_info_cxt(get_opcode(eq_opr), &entry->eq_opr_finfo,
4227 : : TopMemoryContext);
4228 : :
4229 : : /*
4230 : : * If we chose to use a cast from FK to PK type, we may have to apply
4231 : : * the cast function to get to the operator's input type.
4232 : : *
4233 : : * XXX eventually it would be good to support array-coercion cases
4234 : : * here and in ri_CompareWithCast(). At the moment there is no point
4235 : : * because cases involving nonidentical array types will be rejected
4236 : : * at constraint creation time.
4237 : : *
4238 : : * XXX perhaps also consider supporting CoerceViaIO? No need at the
4239 : : * moment since that will never be generated for implicit coercions.
4240 : : */
4241 : 273 : op_input_types(eq_opr, &lefttype, &righttype);
4242 : :
4243 : : /*
4244 : : * pf_eq_oprs (used by the fast path) can be cross-type when the FK
4245 : : * and PK columns differ in type, e.g. int48eq for int4 PK / int8 FK.
4246 : : * If the FK column's type, or the base type of a domain over it,
4247 : : * already matches what the operator expects as its right-hand input,
4248 : : * no cast is needed.
4249 : : */
71 amitlan@postgresql.o 4250 [ + + ]: 273 : if (getBaseType(typeid) == righttype)
3354 tgl@sss.pgh.pa.us 4251 : 237 : castfunc = InvalidOid; /* simplest case */
4252 : : else
4253 : : {
7023 4254 : 36 : pathtype = find_coercion_pathway(lefttype, typeid,
4255 : : COERCION_IMPLICIT,
4256 : : &castfunc);
4257 [ + + + - ]: 36 : if (pathtype != COERCION_PATH_FUNC &&
4258 : : pathtype != COERCION_PATH_RELABELTYPE)
4259 : : {
4260 : : /*
4261 : : * The declared input type of the eq_opr might be a
4262 : : * polymorphic type such as ANYARRAY or ANYENUM, or other
4263 : : * special cases such as RECORD; find_coercion_pathway
4264 : : * currently doesn't subsume these special cases.
4265 : : */
4630 4266 [ - + ]: 16 : if (!IsBinaryCoercible(typeid, lefttype))
7023 tgl@sss.pgh.pa.us 4267 [ # # ]:UBC 0 : elog(ERROR, "no conversion function from %s to %s",
4268 : : format_type_be(typeid),
4269 : : format_type_be(lefttype));
4270 : : }
4271 : : }
7134 tgl@sss.pgh.pa.us 4272 [ + + ]:CBC 273 : if (OidIsValid(castfunc))
4273 : 20 : fmgr_info_cxt(castfunc, &entry->cast_func_finfo,
4274 : : TopMemoryContext);
4275 : : else
4276 : 253 : entry->cast_func_finfo.fn_oid = InvalidOid;
4277 : 273 : entry->valid = true;
4278 : : }
4279 : :
4280 : 1699 : return entry;
4281 : : }
4282 : :
4283 : :
4284 : : /*
4285 : : * Given a trigger function OID, determine whether it is an RI trigger,
4286 : : * and if so whether it is attached to PK or FK relation.
4287 : : */
4288 : : int
7759 neilc@samurai.com 4289 : 5757 : RI_FKey_trigger_type(Oid tgfoid)
4290 : : {
4291 [ + + + ]: 5757 : switch (tgfoid)
4292 : : {
4293 : 1992 : case F_RI_FKEY_CASCADE_DEL:
4294 : : case F_RI_FKEY_CASCADE_UPD:
4295 : : case F_RI_FKEY_RESTRICT_DEL:
4296 : : case F_RI_FKEY_RESTRICT_UPD:
4297 : : case F_RI_FKEY_SETNULL_DEL:
4298 : : case F_RI_FKEY_SETNULL_UPD:
4299 : : case F_RI_FKEY_SETDEFAULT_DEL:
4300 : : case F_RI_FKEY_SETDEFAULT_UPD:
4301 : : case F_RI_FKEY_NOACTION_DEL:
4302 : : case F_RI_FKEY_NOACTION_UPD:
4303 : 1992 : return RI_TRIGGER_PK;
4304 : :
4305 : 1868 : case F_RI_FKEY_CHECK_INS:
4306 : : case F_RI_FKEY_CHECK_UPD:
4307 : 1868 : return RI_TRIGGER_FK;
4308 : : }
4309 : :
4310 : 1897 : return RI_TRIGGER_NONE;
4311 : : }
4312 : :
4313 : : /*
4314 : : * ri_FastPathEndBatch
4315 : : * Flush remaining rows and tear down cached state.
4316 : : *
4317 : : * Registered as an AfterTriggerBatchCallback. Note: the flush can
4318 : : * do real work (CCI, security context switch, index probes) and can
4319 : : * throw ERROR on a constraint violation. If that happens,
4320 : : * ri_FastPathTeardown never runs; ResourceOwner releases the cached
4321 : : * relations and AtEOXact_RI() resets the static state on the abort path.
4322 : : */
4323 : : static void
146 amitlan@postgresql.o 4324 : 1843 : ri_FastPathEndBatch(void *arg)
4325 : : {
4326 : : HASH_SEQ_STATUS status;
4327 : : RI_FastPathEntry *entry;
7 4328 : 1843 : int my_depth = (int) (intptr_t) arg;
4329 : :
146 4330 [ + + ]: 1843 : if (ri_fastpath_cache == NULL)
4331 : 4 : return;
4332 : :
4333 : : /*
4334 : : * Set a flag for the duration of the scan so that any FK check triggered
4335 : : * by user cast or operator code during a flush takes the per-row path
4336 : : * instead of adding a new entry to the cache we are iterating. A new
4337 : : * entry could land in an already-scanned bucket and then be torn down
4338 : : * unflushed below.
4339 : : *
4340 : : * The flush can throw ERROR (a reported constraint violation, or an error
4341 : : * from the user code it runs). In that case ri_FastPathTeardown below is
4342 : : * skipped; the ResourceOwner and the transaction-end callback handle
4343 : : * resource cleanup on the abort path. The PG_FINALLY only resets the
4344 : : * flag and deliberately does not attempt teardown.
4345 : : */
76 4346 [ - + ]: 1839 : Assert(!ri_fastpath_flushing);
4347 : 1839 : ri_fastpath_flushing = true;
4348 [ + + ]: 1839 : PG_TRY();
4349 : : {
4350 : 1839 : hash_seq_init(&status, ri_fastpath_cache);
4351 [ + + ]: 3851 : while ((entry = hash_seq_search(&status)) != NULL)
4352 : : {
4353 : : /* Flush only entries created in the cycle now ending. */
7 4354 [ + + + + ]: 2334 : if (entry->key.query_depth == my_depth && entry->batch_count > 0)
4355 : : {
76 4356 : 2045 : Relation fk_rel = table_open(entry->fk_relid, AccessShareLock);
4357 : : RI_ConstraintInfo *riinfo;
4358 : :
7 4359 : 2045 : riinfo = ri_LoadConstraintInfo(entry->key.conoid);
4360 : :
76 4361 : 2045 : ri_FastPathBatchFlush(entry, fk_rel, riinfo);
4362 : 1723 : table_close(fk_rel, NoLock);
4363 : : }
4364 : : }
4365 : : }
4366 : 322 : PG_FINALLY();
4367 : : {
4368 : 1839 : ri_fastpath_flushing = false;
4369 : : }
4370 [ + + ]: 1839 : PG_END_TRY();
4371 : :
4372 : : /*
4373 : : * Release this cycle's entries and remove them from the cache; leave
4374 : : * outer cycles' entries for their own callbacks. Destroy the cache once
4375 : : * empty.
4376 : : */
7 4377 : 1517 : ri_FastPathTeardown(my_depth);
4378 : : }
4379 : :
4380 : : /*
4381 : : * ri_FastPathTeardown
4382 : : * Release and remove the cached entries of one firing cycle, and drop
4383 : : * the cache once it holds no more entries.
4384 : : *
4385 : : * Called from ri_FastPathEndBatch() with the depth of the cycle that is
4386 : : * ending: it releases only that cycle's entries, leaving an outer cycle's
4387 : : * still-live entries for their own callbacks. The cache (and its static
4388 : : * pointer) go away once the last entry is removed.
4389 : : */
4390 : : static void
4391 : 1517 : ri_FastPathTeardown(int depth)
4392 : : {
4393 : : HASH_SEQ_STATUS status;
4394 : : RI_FastPathEntry *entry;
4395 : :
146 4396 [ - + ]: 1517 : if (ri_fastpath_cache == NULL)
146 amitlan@postgresql.o 4397 :UBC 0 : return;
4398 : :
146 amitlan@postgresql.o 4399 :CBC 1517 : hash_seq_init(&status, ri_fastpath_cache);
4400 [ + + ]: 3507 : while ((entry = hash_seq_search(&status)) != NULL)
4401 : : {
7 4402 [ + + ]: 1990 : if (entry->key.query_depth != depth)
4403 : 268 : continue;
146 4404 [ + - ]: 1722 : if (entry->idx_rel)
4405 : 1722 : index_close(entry->idx_rel, NoLock);
4406 [ + - ]: 1722 : if (entry->pk_rel)
4407 : 1722 : table_close(entry->pk_rel, NoLock);
4408 [ + - ]: 1722 : if (entry->pk_slot)
4409 : 1722 : ExecDropSingleTupleTableSlot(entry->pk_slot);
4410 [ + - ]: 1722 : if (entry->fk_slot)
4411 : 1722 : ExecDropSingleTupleTableSlot(entry->fk_slot);
4412 [ + - ]: 1722 : if (entry->flush_cxt)
4413 : 1722 : MemoryContextDelete(entry->flush_cxt);
7 4414 : 1722 : hash_search(ri_fastpath_cache, &entry->key, HASH_REMOVE, NULL);
4415 : : }
4416 : :
4417 [ + + ]: 1517 : if (hash_get_num_entries(ri_fastpath_cache) == 0)
4418 : : {
4419 : 1249 : hash_destroy(ri_fastpath_cache);
4420 : 1249 : ri_fastpath_cache = NULL;
4421 : 1249 : ri_fastpath_flushing = false;
4422 : : }
4423 : : }
4424 : :
4425 : : /*
4426 : : * AtEOXact_RI
4427 : : * Reset fast-path batching state at end of transaction.
4428 : : *
4429 : : * Called from CommitTransaction() and PrepareTransaction() with isCommit
4430 : : * true, and from AbortTransaction() with isCommit false.
4431 : : *
4432 : : * By the time we get here on a clean commit or prepare, the fast-path cache
4433 : : * has already been flushed and torn down by ri_FastPathEndBatch() (an
4434 : : * AfterTriggerBatchCallback fired from AfterTriggerFireDeferred(), well before
4435 : : * this point), so the static pointers are already clear and the reset below is
4436 : : * a no-op. A surviving cache at commit means a trigger batch was never
4437 : : * flushed, which would have silently skipped FK checks, so we complain.
4438 : : *
4439 : : * On abort, ri_FastPathEndBatch()/ri_FastPathTeardown() may not have run (a
4440 : : * flush can error out partway): the ResourceOwner releases the cached
4441 : : * relations and the TopTransactionContext reset frees the cache memory, but
4442 : : * the process-local static pointers below would dangle into the next
4443 : : * transaction. This resets them so they don't.
4444 : : *
4445 : : * The reset touches only backend-local static state (no relations, locks,
4446 : : * buffers or catalog access), so it has no ordering dependency on the
4447 : : * surrounding ResourceOwnerRelease() / AtEOXact_* steps.
4448 : : */
4449 : : void
59 4450 : 431259 : AtEOXact_RI(bool isCommit)
4451 : : {
4452 : : /*
4453 : : * The cache must be empty on a clean commit or prepare; a survivor means
4454 : : * a trigger batch went unflushed. Assert for assert-enabled builds and,
4455 : : * since the transaction is already committed by now and FK checks may
4456 : : * have been skipped, also warn in production builds.
4457 : : */
4458 [ + + - + ]: 431259 : Assert(ri_fastpath_cache == NULL || !isCommit);
4459 [ + + - + ]: 431259 : if (isCommit && ri_fastpath_cache != NULL)
59 amitlan@postgresql.o 4460 [ # # ]:UBC 0 : elog(WARNING, "RI fast-path cache not flushed at end of transaction");
4461 : :
4462 : : /*
4463 : : * Clear the static pointers/flags. The cache memory lives in
4464 : : * TopTransactionContext and is freed by the end-of-transaction
4465 : : * memory-context reset; here we only drop the references to it.
4466 : : */
146 amitlan@postgresql.o 4467 :CBC 431259 : ri_fastpath_cache = NULL;
4468 : :
4469 : : /*
4470 : : * Also clear the in-flush flag. ri_FastPathEndBatch() already clears it
4471 : : * via PG_FINALLY, so this is just defensive: it keeps a stale flag from
4472 : : * surviving into the next transaction should any future path leave it
4473 : : * set.
4474 : : */
76 4475 : 431259 : ri_fastpath_flushing = false;
4476 : :
4477 : : /*
4478 : : * Release fast-path metadata detached during this transaction by
4479 : : * InvalidateConstraintCacheCallBack(). We are past every RI check that
4480 : : * could still hold a pointer into one of these, so freeing here is safe
4481 : : * on both the commit and the abort path.
4482 : : */
8 4483 [ + + ]: 431972 : while (ri_fpmeta_dead_list != NULL)
4484 : : {
4485 : 713 : FastPathMeta *dead = ri_fpmeta_dead_list;
4486 : :
4487 : 713 : ri_fpmeta_dead_list = dead->next_dead;
4488 : 713 : MemoryContextDelete(dead->scratch_cxt);
4489 : 713 : pfree(dead);
4490 : : }
146 4491 : 431259 : }
4492 : :
4493 : : /*
4494 : : * AtEOSubXact_RI
4495 : : * Reset fast-path batching state at subtransaction end.
4496 : : *
4497 : : * Called from CommitSubTransaction() with isCommit true and from
4498 : : * AbortSubTransaction() with isCommit false, in both cases after the
4499 : : * subtransaction's ResourceOwnerRelease().
4500 : : *
4501 : : * Fast-path cache entries are normally flushed and removed at the end of
4502 : : * their trigger-firing cycle, and the cache is destroyed when its last entry
4503 : : * is removed. Thus, at a normal subtransaction boundary this is a no-op.
4504 : : *
4505 : : * The exception is a batch flush that errors out partway and is caught by this
4506 : : * subtransaction (e.g. a PL/pgSQL EXCEPTION block): ri_FastPathEndBatch()'s
4507 : : * teardown was skipped, so the cache still contains entries whose relations
4508 : : * were opened under this subtransaction's resource owner. That owner has
4509 : : * just released those relations, making the entries stale. Remove those
4510 : : * entries so a later firing cycle cannot reuse them. Entries belonging to
4511 : : * outer subtransactions remain valid and are preserved.
4512 : : *
4513 : : * The remaining slot storage and per-entry flush contexts are reclaimed when
4514 : : * TopTransactionContext is reset at top-level transaction end.
4515 : : */
4516 : : void
5 4517 : 22872 : AtEOSubXact_RI(bool isCommit, SubTransactionId mySubid,
4518 : : SubTransactionId parentSubid)
4519 : : {
4520 : : HASH_SEQ_STATUS status;
4521 : : RI_FastPathEntry *entry;
4522 : : long remaining;
4523 : :
4524 [ + + ]: 22872 : if (ri_fastpath_cache == NULL)
4525 : 22849 : return;
4526 : :
4527 : : /* Process only entries belonging to the ending subtransaction. */
4528 : 23 : hash_seq_init(&status, ri_fastpath_cache);
4529 [ + + ]: 54 : while ((entry = hash_seq_search(&status)) != NULL)
4530 : : {
4531 [ + + ]: 31 : if (entry->subid != mySubid)
4532 : 12 : continue;
4533 : :
4534 [ - + ]: 19 : if (isCommit)
4535 : : {
4536 : : /*
4537 : : * A committing subxact's entry should already have been flushed
4538 : : * and torn down at its statement's end (ri_FastPathEndBatch()),
4539 : : * so we don't expect to find one here. If we do, reassign it to
4540 : : * the parent so it's still cleaned up rather than left under a
4541 : : * subxact id that no longer exists.
4542 : : */
5 amitlan@postgresql.o 4543 :UBC 0 : Assert(false);
4544 : : entry->subid = parentSubid;
4545 : : }
4546 : : else
5 amitlan@postgresql.o 4547 :CBC 19 : hash_search(ri_fastpath_cache, &entry->key, HASH_REMOVE, NULL);
4548 : : }
4549 : :
4550 : : /* If that emptied the cache, drop it so the next batch starts clean. */
4551 : 23 : remaining = hash_get_num_entries(ri_fastpath_cache);
4552 [ + + ]: 23 : if (remaining == 0)
4553 : : {
4554 : 11 : hash_destroy(ri_fastpath_cache);
4555 : 11 : ri_fastpath_cache = NULL;
4556 : 11 : ri_fastpath_flushing = false;
4557 : : }
4558 : : }
4559 : :
4560 : : /*
4561 : : * ri_FastPathGetEntry
4562 : : * Look up or create a per-batch cache entry for the given constraint.
4563 : : *
4564 : : * On first call for a constraint within a batch: opens pk_rel and the index,
4565 : : * allocates slots for both FK row and the looked up PK row, and registers the
4566 : : * cleanup callback.
4567 : : *
4568 : : * On subsequent calls: returns the existing entry.
4569 : : */
4570 : : static RI_FastPathEntry *
146 4571 : 606014 : ri_FastPathGetEntry(const RI_ConstraintInfo *riinfo, Relation fk_rel)
4572 : : {
4573 : : RI_FastPathKey key;
4574 : : RI_FastPathEntry *entry;
4575 : : bool found;
7 4576 : 606014 : int cur_depth = AfterTriggerCurrentQueryDepth();
4577 : :
4578 : 606014 : key.conoid = riinfo->constraint_id;
4579 : 606014 : key.query_depth = cur_depth;
4580 : :
4581 : : /* Create hash table on first use in this batch */
146 4582 [ + + ]: 606014 : if (ri_fastpath_cache == NULL)
4583 : : {
4584 : : HASHCTL ctl;
4585 : :
7 4586 : 1567 : ctl.keysize = sizeof(RI_FastPathKey);
146 4587 : 1567 : ctl.entrysize = sizeof(RI_FastPathEntry);
4588 : 1567 : ctl.hcxt = TopTransactionContext;
4589 : 1567 : ri_fastpath_cache = hash_create("RI fast-path cache",
4590 : : 16,
4591 : : &ctl,
4592 : : HASH_ELEM | HASH_BLOBS | HASH_CONTEXT);
4593 : : }
4594 : :
7 4595 : 606014 : entry = hash_search(ri_fastpath_cache, &key,
4596 : : HASH_ENTER, &found);
4597 : :
146 4598 [ + + ]: 606014 : if (!found)
4599 : : {
4600 : : MemoryContext oldcxt;
4601 : :
4602 : : /*
4603 : : * Zero out non-key fields so ri_FastPathTeardown is safe if we error
4604 : : * out during partial initialization below.
4605 : : */
4606 : 2080 : memset(((char *) entry) + offsetof(RI_FastPathEntry, pk_rel), 0,
4607 : : sizeof(RI_FastPathEntry) - offsetof(RI_FastPathEntry, pk_rel));
4608 : :
4609 : 2080 : oldcxt = MemoryContextSwitchTo(TopTransactionContext);
4610 : :
4611 : 2080 : entry->fk_relid = RelationGetRelid(fk_rel);
4612 : :
4613 : : /*
4614 : : * Open PK table and its unique index.
4615 : : *
4616 : : * RowShareLock on pk_rel matches what the SPI path's SELECT ... FOR
4617 : : * KEY SHARE would acquire as a relation-level lock. AccessShareLock
4618 : : * on the index is standard for index scans.
4619 : : *
4620 : : * We don't release these locks until end of transaction, matching SPI
4621 : : * behavior.
4622 : : */
4623 : :
9 4624 : 2080 : INJECTION_POINT("ri-before-pk-lock", NULL);
4625 : :
146 4626 : 2080 : entry->pk_rel = table_open(riinfo->pk_relid, RowShareLock);
4627 : :
4628 : : /*
4629 : : * conindid may have been read before we took that lock, and REINDEX
4630 : : * CONCURRENTLY moves a constraint to a new index. Re-read it now:
4631 : : * LockRelationOid() processes invalidation messages after acquiring
4632 : : * the lock, so we either see the new index, or an old one that cannot
4633 : : * be marked dead or dropped until this transaction ends.
4634 : : */
9 4635 : 2080 : riinfo = ri_LoadConstraintInfo(riinfo->constraint_id);
4636 : :
146 4637 : 2080 : entry->idx_rel = index_open(riinfo->conindid, AccessShareLock);
4638 : 2080 : entry->pk_slot = table_slot_create(entry->pk_rel, NULL);
4639 : :
4640 : : /*
4641 : : * Must be TTSOpsHeapTuple because ExecStoreHeapTuple() is used to
4642 : : * load entries from batch[] into this slot for value extraction.
4643 : : */
4644 : 2080 : entry->fk_slot = MakeSingleTupleTableSlot(RelationGetDescr(fk_rel),
4645 : : &TTSOpsHeapTuple);
4646 : :
4647 : 2080 : entry->flush_cxt = AllocSetContextCreate(TopTransactionContext,
4648 : : "RI fast path flush temporary context",
4649 : : ALLOCSET_SMALL_SIZES);
4650 : 2080 : MemoryContextSwitchTo(oldcxt);
4651 : :
4652 : : /*
4653 : : * Register an end-of-batch callback once per firing cycle, passing
4654 : : * the query depth so the callback flushes only entries belonging to
4655 : : * that cycle.
4656 : : */
4657 : : {
7 4658 : 2080 : bool depth_registered = false;
4659 : : HASH_SEQ_STATUS reg_status;
4660 : : RI_FastPathEntry *other;
4661 : :
4662 : : /*
4663 : : * An existing entry at this depth means its callback is already
4664 : : * registered. Ignore the just-created entry, which is already in
4665 : : * the hash.
4666 : : */
4667 : 2080 : hash_seq_init(®_status, ri_fastpath_cache);
4668 [ + + ]: 4377 : while ((other = hash_seq_search(®_status)) != NULL)
4669 : : {
4670 [ + + + + ]: 2530 : if (other != entry && other->key.query_depth == cur_depth)
4671 : : {
4672 : 233 : depth_registered = true;
4673 : 233 : hash_seq_term(®_status);
4674 : 233 : break;
4675 : : }
4676 : : }
4677 : :
4678 [ + + ]: 2080 : if (!depth_registered)
4679 : 1847 : RegisterAfterTriggerBatchCallback(ri_FastPathEndBatch,
4680 : 1847 : (void *) (intptr_t) cur_depth);
4681 : : }
4682 : :
76 4683 : 2080 : entry->flushing = false;
4684 : 2080 : entry->batch_count = 0;
5 4685 : 2080 : entry->subid = GetCurrentSubTransactionId();
4686 : : }
4687 : :
146 4688 : 606014 : return entry;
4689 : : }
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